2012 Net 4.5.pdf

7/27/2019 2012 Net 4.5.pdf

http://slidepdf.com/reader/full/2012-net-45pdf 1/40

What's New in ASP.NET 4.5 and Visual Studio 2012This document describes new features and enhancements that are being introduced in ASP.NET 4.5. It also

describes improvements being made for web development in Visual Studio (Visual Web Developer).

ASP.NET Core Runtime and Framework Asynchronously Reading and Writing HTTP Requests and Responses

Improvements to HttpRequest handling

Asynchronously flushing a response

Support for await and Task -Based Asynchronous Modules and Handlers

Asynchronous HTTP modules

Asynchronous HTTP handlers

New ASP.NET Request Validation Features

Deferred ("lazy") request validation

Support for unvalidated requests

AntiXSS Library

Support for WebSockets Protocol

Bundling and Minification

Performance Improvements for Web Hosting

Key Performance Factors

Requirements for New Performance Features

Sharing Common Assemblies

Using multi-Core JIT compilation for faster startup

Tuning garbage collection to optimize for memory

Prefetching for web applications

ASP.NET Web Forms

Strongly Typed Data Controls

Model Binding

Selecting data

Value providers

Filtering by values from a control

HTML Encoded Data-Binding Expressions

Unobtrusive Validation

HTML5 Updates

ASP.NET MVC 4

ASP.NET Web Pages 2

Visual Studio 2012 Release Candidate

Project Sharing Between Visual Studio 2010 and Visual Studio 2012 Release Candidate (Project

Compatibility)

Configuration Changes in ASP.NET 4.5 Website Templates

Native Support in IIS 7 for ASP.NET Routing

HTML Editor

Smart Tasks

WAI-ARIA support

New HTML5 snippets

Extract to user control

IntelliSense for code nuggets in attributes

http://www.asp.net/vnext/overview/whitepapers/whats-new#_Toc318097372






























http://www.asp.net/vnext/overview/whitepapers/whats-new#_Toc_perf


http://www.asp.net/vnext/overview/whitepapers/whats-new#_Toc_perf_1




































http://www.asp.net/vnext/overview/whitepapers/whats-new#project-compatibility





http://www.asp.net/vnext/overview/whitepapers/whats-new#Configuration_Changes_In_ASPNET45_Website_Templates


http://www.asp.net/vnext/overview/whitepapers/whats-new#Native_Support_In_IIS7_For_ASPNET_Routine
























































7/27/2019 2012 Net 4.5.pdf


Automatic renaming of matching tag when you rename an opening or closing tag

Event handler generation

Smart indent

Auto-reduce statement completion

JavaScript Editor

Code outlining

Brace matching

Go to Definition

ECMAScript5 support

DOM IntelliSense

VSDOC signature overloads

Implicit references

CSS Editor


Hierarchical indentation.

CSS hacks support

Vendor specific schemas (-moz-,-webkit)

Commenting and uncommenting support

Color picker

Snippets

Custom regions

Page Inspector

Publishing

Publish profiles

ASP.NET precompilation and merge

IIS Express

Disclaimer

ASP.NET Core Runtime and Framework

Asynchronously Reading and Writing HTTP Requests and

Responses

ASP.NET 4 introduced the ability to read an HTTP request entity as a stream using

theHttpRequest.GetBufferlessInputStream method. This method provided streaming access to the request

entity. However, it executed synchronously, which tied up a thread for the duration of a request.

ASP.NET 4.5 supports the ability to read streams asynchronously on an HTTP request entity, and the abilityto flush asynchronously. ASP.NET 4.5 also gives you the ability to double-buffer an HTTP request entity,

which provides easier integration with downstream HTTP handlers such as .aspx page handlers and

ASP.NET MVC controllers.

Improvements to HttpRequest handling


















































































7/27/2019 2012 Net 4.5.pdf


The Stream reference returned by ASP.NET 4.5 from HttpRequest.GetBufferlessInputStream supports both

synchronous and asynchronous read methods. The Stream object returned

from GetBufferlessInputStream now implements both the BeginRead and EndRead methods. The

asynchronous Stream methods let you asynchronously read the request entity in chunks, while ASP.NET

releases the current thread between each iteration of an asynchronous read loop.

ASP.NET 4.5 has also added a companion method for reading the request entity in a bufferedway:HttpRequest.GetBufferedInputStream. This new overload works like GetBufferlessInputStream,

supporting both synchronous and asynchronous reads. However, as it reads, GetBufferedInputStream also

copies the entity bytes into ASP.NET internal buffers so that downstream modules and handlers can still

access the request entity. For example, if some upstream code in the pipeline has already read the request

entity using GetBufferedInputStream, you can still use HttpRequest.Form or HttpRequest.Files. This lets you

perform asynchronous processing on a request (for example, streaming a large file upload to a database),

but still run .aspx pages and MVC ASP.NET controllers afterward.

Asynchronously flushing a response

Sending responses to an HTTP client can take considerable time when the client is far away or has a low-

bandwidth connection. Normally ASP.NET buffers the response bytes as they are created by an

application. ASP.NET then performs a single send operation of the accrued buffers at the very end of

request processing.

If the buffered response is large (for example, streaming a large file to a client), you must periodically

callHttpResponse.Flush to send buffered output to the client and keep memory usage under control.

However, becauseFlush is a synchronous call, iteratively calling Flush still consumes a thread for the

duration of potentially long-running requests.

ASP.NET 4.5 adds support for performing flushes asynchronously using

the BeginFlush and EndFlush methods of theHttpResponse class. Using these methods, you can create

asynchronous modules and asynchronous handlers that incrementally send data to a client without tying

up operating-system threads. In between BeginFlush and EndFlushcalls, ASP.NET releases the current

thread. This substantially reduces the total number of active threads that are needed in order to support

long-running HTTP downloads.

Support for await and Task -Based Asynchronous Modules

and HandlersThe .NET Framework 4 introduced an asynchronous programming concept referred to as a task . Tasks are

represented by the Task type and related types in the System.Threading.Tasks namespace. The .NET

Framework 4.5 builds on this with compiler enhancements that make working with Task objects simple. In

the .NET Framework 4.5, the compilers support two new keywords: await and async. The await keyword is

syntactical shorthand for indicating that a piece of code should asynchronously wait on some other piece

of code. The async keyword represents a hint that you can use to mark methods as task-basedasynchronous methods.

The combination of await , async, and the Task object makes it much easier for you to write asynchronous

code in .NET 4.5. ASP.NET 4.5 supports these simplifications with new APIs that let you write asynchronous

HTTP modules and asynchronous HTTP handlers using the new compiler enhancements.

Asynchronous HTTP modules

7/27/2019 2012 Net 4.5.pdf


Suppose that you want to perform asynchronous work within a method that returns a Task object. The

following code example defines an asynchronous method that makes an asynchronous call to download

the Microsoft home page. Notice the use of the async keyword in the method signature and the await call

to DownloadStringTaskAsync.

private async Task

ScrapeHtmlPage(object caller, EventArgs e) {

WebClient wc = new WebClient();

var result = await wc.DownloadStringTaskAsync ("http://www.microsoft.com" );

// Do something with the result

}

That's all you have to write — the .NET Framework will automatically handle unwinding the call stack while

waiting for the download to complete, as well as automatically restoring the call stack after the download

is done.

Now suppose that you want to use this asynchronous method in an asynchronous ASP.NET HTTP module.

ASP.NET 4.5 includes a helper method (EventHandlerTaskAsyncHelper ) and a new delegate type(TaskEventHandler ) that you can use to integrate task-based asynchronous methods with the older

asynchronous programming model exposed by the ASP.NET HTTP pipeline. This example shows how:

public void Init(HttpApplication

context)

{

// Wrap the Task-based method so that it can be used with

// the older async programming model.

EventHandlerTaskAsyncHelper helper =

new EventHandlerTaskAsyncHelper (ScrapeHtmlPage);

// The helper object makes it easy to extract Begin/End methods out of

// a method that returns a Task object. The ASP.NET pipeline calls the

// Begin and End methods to start and complete calls on asynchronous

// HTTP modules.

context.AddOnPostAuthorizeRequestAsync (

helper.BeginEventHandler, helper.EndEventHandler);

}

Asynchronous HTTP handlers

The traditional approach to writing asynchronous handlers in ASP.NET is to implement

the IHttpAsyncHandler interface. ASP.NET 4.5 introduces the HttpTaskAsyncHandler asynchronous base

type that you can derive from, which makes it much easier to write asynchronous handlers.

The HttpTaskAsyncHandler type is abstract and requires you to override the ProcessRequestAsync method.

Internally ASP.NET takes care of integrating the return signature (a Task object)

of ProcessRequestAsync with the older asynchronous programming model used by the ASP.NET pipeline.

The following example shows how you can use Task and await as part of the implementation of an

asynchronous HTTP handler:

7/27/2019 2012 Net 4.5.pdf


public class MyAsyncHandler : HttpTaskAsyncHandler

{

// ...

// ASP.NET automatically takes care of integrating the Task based override

// with the ASP.NET pipeline. public override async Task ProcessRequestAsync(HttpContext context)

{

WebClient wc = new WebClient();

var result = await

wc.DownloadStringTaskAsync("http://www.microsoft.com" );

// Do something with the result

}

}

New ASP.NET Request Validation Features

By default, ASP.NET performs request validation — it examines requests to look for markup or script in

fields, headers, cookies, and so on. If any is detected, ASP.NET throws an exception. This acts as a first line

of defense against potential cross-site scripting attacks.

ASP.NET 4.5 makes it easy to selectively read unvalidated request data. ASP.NET 4.5 also integrates the

popular AntiXSS library, which was formerly an external library.

Developers have frequently asked for the ability to selectively turn off request validation for their

applications. For example, if your application is forum software, you might want to allow users to submit

HTML-formatted forum posts and comments, but still make sure that request validation is checking

everything else.

ASP.NET 4.5 introduces two features that make it easy for you to selectively work with unvalidated input:

deferred ("lazy") request validation and access to unvalidated request data.

Deferred ("lazy") request validation

In ASP.NET 4.5, by default all request data is subject to request validation. However, you can configure the

application to defer request validation until you actually access request data. (This is sometimes referred

to as lazy request validation, based on terms like lazy loading for certain data scenarios.) You can

configure the application to use deferred validation in the Web.config file by setting

the requestValidationMode attribute to 4.5 in thehttpRUntime element, as in the following example:<httpRuntime requestValidationMode="4.5" ... />

When request validation mode is set to 4.5, request validation is triggered only for a specific request value

and only when your code accesses that value. For example, if your code gets the value of

Request.Form["forum_post"], request validation is invoked only for that element in the form collection.

None of the other elements in the Formcollection are validated. In previous versions of ASP.NET, request

validation was triggered for the entire request collection when any element in the collection was accessed.

7/27/2019 2012 Net 4.5.pdf


The new behavior makes it easier for different application components to look at different pieces of

request data without triggering request validation on other pieces.

Support for unvalidated requests

Deferred request validation alone doesn't solve the problem of selectively bypassing request validation.

The call to Request.Form["forum_post"] still triggers request validation for that specific request value.However, you might want to access this field without triggering validation because you want to allow

markup in that field.

To allow this, ASP.NET 4.5 now supports unvalidated access to request data. ASP.NET 4.5 includes a

newUnvalidated collection property in the HttpRequest class. This collection provides access to all of the

common values of request data, like Form, QueryString, Cookies, and Url.

Using the forum example, to be able to read unvalidated request data, you first need to configure the

application to use the new request validation mode:

<httpRuntime requestValidationMode="4.5" ...

/> You can then use the HttpRequest.Unvalidated property to read the unvalidated form value:

var s = context.Request.Unvalidated.Form["forum_post"];

Security Note: Use unvalidated request data with care! ASP.NET 4.5 added the unvalidated request

properties and collections to make it easier for you to access very specific unvalidated request data.

However, you must still perform custom validation on the raw request data to ensure that dangerous text

is not rendered to users.

AntiXSS Library

Due to the popularity of the Microsoft AntiXSS Library, ASP.NET 4.5 now incorporates core encoding

routines from version 4.0 of that library.

The encoding routines are implemented by the AntiXssEncoder type in the

new System.Web.Security.AntiXssnamespace. You can use the AntiXssEncoder type directly by calling any of

the static encoding methods that are implemented in the type. However, the easiest approach for using

the new anti-XSS routines is to configure an ASP.NET application to use the AntiXssEncoder class by

default. To do this, add the following attribute to the Web.config file:

<httpRuntime ...

encoderType="System.Web.Security.AntiXss.AntiXssEncoder,System.Web,

Version=4.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a" />

When the encoderType attribute is set to use the AntiXssEncoder type, all output encoding in ASP.NETautomatically uses the new encoding routines.

These are the portions of the external AntiXSS library that have been incorporated into ASP.NET 4.5:

HtmlEncode, HtmlFormUrlEncode, and HtmlAttributeEncode

XmlAttributeEncode and XmlEncode

UrlEncode and UrlPathEncode (new)

CssEncode

7/27/2019 2012 Net 4.5.pdf


Support for WebSockets Protocol

WebSockets protocol is a standards-based network protocol that defines how to establish secure, real-

time bidirectional communications between a client and a server over HTTP. Microsoft has worked with

both the IETF and W3C standards bodies to help define the protocol. The WebSockets protocol is

supported by any client (not just browsers), with Microsoft investing substantial resources supporting

WebSockets protocol on both client and mobile operating systems.

WebSockets protocol makes it much easier to create long-running data transfers between a client and a

server. For example, writing a chat application is much easier because you can establish a true long-

running connection between a client and a server. You do not have to resort to workarounds like periodic

polling or HTTP long-polling to simulate the behavior of a socket.

ASP.NET 4.5 and IIS 8 include low-level WebSockets support, enabling ASP.NET developers to use

managed APIs for asynchronously reading and writing both string and binary data on a WebSockets

object. For ASP.NET 4.5, there is a new System.Web.WebSockets namespace that contains types for

working with WebSockets protocol.

A browser client establishes a WebSockets connection by creating a DOM WebSocket object that points to

a URL in an ASP.NET application, as in the following example:

socket = new WebSocket("ws://contoso.com/MyWebSocketApplication.ashx" );

You can create WebSockets endpoints in ASP.NET using any kind of module or handler. In the previous

example, an .ashx file was used, because .ashx files are a quick way to create a handler.

According to the WebSockets protocol, an ASP.NET application accepts a client's WebSockets request by

indicating that the request should be upgraded from an HTTP GET request to a WebSockets request.

Here's an example:

HttpContext.Current.AcceptWebSocketRequest(// WebSocket delegate goes here)

The AcceptWebSocketRequest method accepts a function delegate because ASP.NET unwinds the current

HTTP request and then transfers control to the function delegate. Conceptually this approach is similar to

how you useSystem.Threading.Thread , where you define a thread-start delegate in which background

work is performed.

After ASP.NET and the client have successfully completed a WebSockets handshake, ASP.NET calls your

delegate and the WebSockets application starts running. The following code example shows a simple

echo application that uses the built-in WebSockets support in ASP.NET:

public async Task MyWebSocket(AspNetWebSocketContext context) {

WebSocket socket = context.WebSocket;

while (true)

{

ArraySegment<byte> buffer = new ArraySegment<byte>(new byte[1024]);

// Asynchronously wait for a message to arrive from a client

7/27/2019 2012 Net 4.5.pdf


WebSocketReceiveResult result =

await socket.ReceiveAsync(buffer, CancellationToken.None);

// If the socket is still open, echo the message back to the client

if (socket.State == WebSocketState.Open)

{ string userMessage = Encoding.UTF8.GetString(buffer.Array, 0,

result.Count);

userMessage = "You sent: " + userMessage + " at " +

DateTime.Now.ToLongTimeString();

buffer = new

ArraySegment<byte>(Encoding.UTF8.GetBytes(userMessage));

// Asynchronously send a message to the client

await socket.SendAsync(buffer, WebSocketMessageType.Text,

true, CancellationToken.None);

}

else { break; }

}

}

The support in .NET 4.5 for the await keyword and asynchronous task-based operations is a natural fit for

writing WebSockets applications. The code example shows that a WebSockets request runs completely

asynchronously inside ASP.NET. The application waits asynchronously for a message to be sent from a

client by calling await socket.ReceiveAsync. Similarly, you can send an asynchronous message to a client by

calling await socket.SendAsync.

In the browser, an application receives WebSockets messages through an onmessage function. To send a

message from a browser, you call the send method of the WebSocket DOM type, as shown in this example:

// Receive a string message from the server. socket.onmessage = function(msg)

{

document.getElementById("serverData").innerHTML = msg.data;

};

// Send a string message from the browser.

socket.send(document.getElementById("msgText"));

In the future, we might release updates to this functionality that abstract away some of the low-level

coding that is required in this release for WebSockets applications.

Bundling and MinificationBundling lets you combine individual JavaScript and CSS files into a bundle that can be treated like a

single file. Minification condenses JavaScript and CSS files by removing whitespace and other characters

that are not required. These features work with Web Forms, ASP.NET MVC, and Web Pages.

Bundles are created using the Bundle class or one of its child classes, ScriptBundle and StyleBundle. After

configuring an instance of a bundle, the bundle is made available to incoming requests by simply adding

7/27/2019 2012 Net 4.5.pdf


it to a global BundleCollection instance. In the default templates, bundle configuration is performed in a

BundleConfig file. This default configuration creates bundles for all of the core scripts and css files used by

the templates.

Bundles are referenced from within views by using one of a couple possible helper methods. In order to

support rendering different markup for a bundle when in debug vs. release mode, the ScriptBundle andStyleBundle classes have the helper method, Render. When in debug mode, Render will generate markup

for each resource in the bundle. When in release mode, Render will generate a single markup element for

the entire bundle. Toggling between debug and release mode can be accomplished by modifying the

debug attribute of the compilation element in web.config as shown below:

<system.web>

<compilation targetframework="4.5" debug="true" />

...</system.web>

Additionally, enabling or disabling optimization can be set directly via the

BundleTable.EnableOptimizations property.

BundleTable.EnableOptimizations = true;

When files are bundled, they are first sorted alphabetically (the way they are displayed in Solution

Explorer). They are then organized so that known libraries and their custom extensions (such as jQuery,

MooTools, and Dojo) are loaded first. For example, the final order for the bundling of the Scripts folder as

shown above will be:

1. jquery-1.6.2.js

2. jquery-ui.js

3. jquery.tools.js

4. a.js

CSS files are also sorted alphabetically and then reorganized so that reset.css and normalize.css come

before any other file. The final sorting of the bundling of the Styles folder shown above will be this:

1. reset.css

2. content.css

3. forms.css

4. globals.css

5. menu.css

6. styles.css

Performance Improvements for Web Hosting

The .NET Framework 4.5 and Windows 8 introduce features that can help you achieve a significant

performance boost for web-server workloads. This includes a reduction (up to 35%) in both startup time

and in the memory footprint of web hosting sites that use ASP.NET.

Key performance factors

7/27/2019 2012 Net 4.5.pdf


Ideally, all websites should be active and in memory to assure quick response to the next request,

whenever it comes. Factors that can affect site responsiveness include:

The time it takes for a site to restart after an app pool recycles. This is the time it takes to launch a

web server process for the site when the site assemblies are no longer in memory. (The platform

assemblies are still in memory, since they are used by other sites.) This situation is referred to as"cold site, warm framework startup" or just "cold site startup."

How much memory the site occupies. Terms for this are "per-site memory consumption" or

"unshared working set."

The new performance improvements focus on both of these factors.

Requirements for New Performance Features

The requirements for the new features can be broken down into these categories:

Improvements that run on the .NET Framework 4.

Improvements that require the .NET Framework 4.5 but can run on any version of Windows.

Improvements that are available only with .NET Framework 4.5 running on Windows 8.

Performance increases with each level of improvement that you are able to enable.

Some of the .NET Framework 4.5 improvements take advantage of broader performance features that

apply to other scenarios as well.

Sharing Common Assemblies

Requirement: .NET Framework 4 and Visual Studio 11 Developer Preview SDK

Different sites on a server often use the same helper assemblies (for example, assemblies from a starter kitor sample application). Each site has its own copy of these assemblies in its Bin directory. Even though the

object code for the assemblies is identical, they're physically separate assemblies, so each assembly has to

be read separately during cold site startup and kept separately in memory.

The new interning functionality solves this inefficiency and reduces both RAM requirements and load

time. Interning lets Windows keep a single copy of each assembly in the file system, and individual

assemblies in the site Bin folders are replaced with symbolic links to the single copy. If an individual site

needs a distinct version of the assembly, the symbolic link is replaced by the new version of the assembly,

and only that site is affected.

Sharing assemblies using symbolic links requires a new tool named aspnet_intern.exe, which lets you

create and manage the store of interned assemblies. It is provided as a part of the Visual Studio 11

Developer Preview SDK. (However, it will work on a system that has only the .NET Framework 4 installed,

assuming you have installed the latest update.)

To make sure all eligible assemblies have been interned, you run aspnet_intern.exe periodically (for

example, once a week as a scheduled task). A typical use is as follows:

http://support.microsoft.com/kb/2468871




7/27/2019 2012 Net 4.5.pdf


aspnet_intern -mode exec -sourcedir

"C:\Windows\Microsoft.NET\Framework\v4.0.30319\Temporary ASP.NET Files" -interndir

C:\ASPNETCommonAssemblies

To see all options, run the tool with no arguments.

Using multi-Core JIT compilation for faster startup

Requirement: .NET Framework 4.5

For a cold site startup, not only do assemblies have to be read from disk, but the site must be JIT-

compiled. For a complex site, this can add significant delays. A new general-purpose technique in the .NET

Framework 4.5 reduces these delays by spreading JIT-compilation across available processor cores. It does

this as much and as early as possible by using information gathered during previous launches of the site.

This functionality implemented by theSystem.Runtime.ProfileOptimization.StartProfile method.

JIT-compiling using multiple cores is enabled by default in ASP.NET, so you do not need to do anything to

take advantage of this feature. If you want to disable this feature, make the following setting in the

Web.config file:

<configuration>



<system.web>

<compilation profileGuidedOptimizations ="None" />



Tuning garbage collection to optimize for memory

Requirement: .NET Framework 4.5

Once a site is running, its use of the garbage-collector (GC) heap can be a significant factor in its memory

consumption. Like any garbage collector, the .NET Framework GC makes tradeoffs between CPU time(frequency and significance of collections) and memory consumption (extra space that is used for new,

freed, or free-able objects). For previous releases, we have provided guidance on how to configure the GC

to achieve the right balance (for example, see ASP.NET 2.0/3.5 Shared Hosting Configuration).

For the .NET Framework 4.5, instead of multiple standalone settings, a workload-defined configuration

setting is available that enables all of the previously recommended GC settings as well as new tuning that

delivers additional performance for the per-site working set.

To enable GC memory tuning, add the following setting to the

Windows\Microsoft.NET\Framework\v4.0.30319\aspnet.config file:

<configuration> 

<runtime>

<performanceScenario value="HighDensityWebHosting" />



(If you're familiar with the previous guidance for changes to aspnet.config, note that this setting replaces

the old settings — for example, there is no need to set gcServer, gcConcurrent, etc. You do not have to

remove the old settings.)

http://msdn.microsoft.com/en-us/library/system.runtime.profileoptimization.startprofile(VS.110).aspx


http://learn.iis.net/page.aspx/50/aspnet-20-35-shared-hosting-configuration/





7/27/2019 2012 Net 4.5.pdf


Prefetching for web applications

Requirement: .NET Framework 4.5 running on Windows 8

For several releases, Windows has included a technology known as the prefetcher that reduces the disk-

read cost of application startup. Because cold startup is a problem predominantly for client applications,

this technology has not been included in Windows Server, which includes only components that areessential to a server. Prefetching is now available in the latest version of Windows Server, where it can

optimize the launch of individual websites.

For Windows Server, the prefetcher is not enabled by default. To enable and configure the prefetcher for

high-density web hosting, run the following set of commands at the command line:

sc config sysmain start=auto

reg add "HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Session Manager\Memory

Management\PrefetchParameters" /v EnablePrefetcher /t REG_DWORD /d 2 /f

reg add "HKEY_LOCAL_MACHINE\Software\Microsoft\Windows NT\CurrentVersion\Prefetcher"

/v MaxPrefetchFiles /t REG_DWORD /d 8192 /f

net start sysmain

Then, to integrate the prefetcher with ASP.NET applications, add the following to the Web.config file:

<configuration>



<system.web>

<compilation enablePrefetchOptimization ="true" />



ASP.NET Web Forms

Strongly Typed Data Controls

In ASP.NET 4.5, Web Forms includes some improvements for working with data. The first improvement is

strongly typed data controls. For Web Forms controls in previous versions of ASP.NET, you display a data-

bound value using Eval and a data-binding expression:

<ul>

<asp:Repeater runat="server" ID="customers">

<ItemTemplate>

<li> First Name: <%# Eval("FirstName")%><br />

Last Name: <%# Eval("LastName")%><br />

</li>

</ItemTemplate>

</asp:Repeater>

</ul>

For two-way data binding, you use Bind :

http://en.wikipedia.org/wiki/Prefetcher




7/27/2019 2012 Net 4.5.pdf


<asp:FormView runat="server" ID="editCustomer">

<EditItemTemplate>

<div>

<asp:Label runat="server" AssociatedControlID="firstName">

First Name:</asp:Label>

<asp:TextBox ID="firstName" runat="server"Text='<%#Bind("FirstName") %>' />

</div>

<div>

<asp:Label runat="server" AssociatedControlID="lastName">


<asp:TextBox ID="lastName" runat="server"

Text='<%#

Bind("LastName") %>' />

</div>

<asp:Button runat="server" CommandName="Update"/>

</EditItemTemplate> </asp:FormView>

At run time, these calls use reflection to read the value of the specified member and then display the

result in the markup. This approach makes it easy to data bind against arbitrary, unshaped data.

However, data-binding expressions like this don't support features like IntelliSense for member names,

navigation (like Go To Definition), or compile-time checking for these names.

To address this issue, ASP.NET 4.5 adds the ability to declare the data type of the data that a control is

bound to. You do this using the new ItemType property. When you set this property, two new typed

variables are available in the scope of data-binding expressions: Item and BindItem. Because the variables

are strongly typed, you get the full benefits of the Visual Studio development experience.For two-way data-binding expressions, use the BindItem variable:

<asp:FormView runat="server" ID="editCustomer">

<EditItemTemplate>

<div>

<asp:Label runat="server" AssociatedControlID="firstName">


<asp:TextBox ID="firstName" runat="server"

Text='<%#BindItem.FirstName %>' />

</div>

<div>

<asp:Label runat="server" AssociatedControlID="lastName"> First Name:</asp:Label>

<asp:TextBox ID="lastName" runat="server"

Text='<%#BindItem.LastName %>' />

</div>

<asp:Button runat="server" CommandName="Update"/>

</EditItemTemplate>

</asp:FormView>

7/27/2019 2012 Net 4.5.pdf


Most controls in the ASP.NET Web Forms framework that support data binding have been updated to

support theItemType property.

Model Binding

Model binding extends data binding in ASP.NET Web Forms controls to work with code-focused data

access. It incorporates concepts from the ObjectDataSource control and from model binding in ASP.NET

MVC.

Selecting data

To configure a data control to use model binding to select data, you set the

control's SelectMethod property to the name of a method in the page's code. The data control calls the

method at the appropriate time in the page life cycle and automatically binds the returned data. There's

no need to explicitly call the DataBind method.

In the following example, the GridView control is configured to use a method named GetCategories:

<asp:GridView ID="categoriesGrid"

runat="server" ItemType="WebApplication1.Model.Category"

SelectMethod="GetCategories" AutoGenerateColumns="false">

<Columns>

<asp:BoundField DataField="CategoryID" HeaderText="ID" />

<asp:BoundField DataField="CategoryName" HeaderText="Name" />

<asp:BoundField DataField="Description" HeaderText="Description" />

<asp:TemplateField HeaderText="# of Products">

<ItemTemplate><%# Item.Products.Count %></ItemTemplate>

</asp:TemplateField>

</Columns>

</asp:GridView>

You create the GetCategories method in the page's code. For a simple select operation, the method needs

no parameters and should return an IEnumerable or IQueryable object. If the new ItemType property is set

(which enables strongly typed data-binding expressions, as explained under Strongly Typed Data

Controls earlier), the generic versions of these interfaces should be returned —

IEnumerable<T> or IQueryable<T>, with the T parameter matching the type of the ItemType property (for

example, IQueryable<Category>).

The following example shows the code for a GetCategories method. This example uses the Entity

Framework Code First model with the Northwind sample database. The code makes sure that the query

returns details of the related products for each category by way of the Include method. (This ensures that

the TemplateField element in the markup displays the count of products in each category without

requiring an n+1 select.)public IQueryable<Category>

GetCategories()

{

var db = new Northwind();

return db.Categories.Include(c => c.Products);

}

http://www.asp.net/vnext/overview/whitepapers/whats-new#_Strongly_Typed_Data




http://stackoverflow.com/questions/97197/what-is-the-n1-selects-problem






7/27/2019 2012 Net 4.5.pdf


When the page runs, the GridView control calls the GetCategories method automatically and renders the

returned data using the configured fields:

Because the select method returns an IQueryable object, the GridView control can further manipulate the

query before executing it. For example, the GridView control can add query expressions for sorting and

paging to the returned IQueryable object before it is executed, so that those operations are performed by

the underlying LINQ provider. In this case, Entity Framework will ensure those operations are performed inthe database.

The following example shows the GridView control modified to allow sorting and paging:

<asp:GridView ID="categoriesGrid"

runat="server"

AutoGenerateColumns="false"

AllowSorting="true" AllowPaging="true" PageSize="5"

ItemType="WebApplication1.Model.Category" DataKeyNames="CategoryID"

SelectMethod="GetCategories"

UpdateMethod="UpdateCategory">

<Columns>

<asp:BoundField DataField="CategoryID" HeaderText="ID" SortExpression="CategoryID" />

<asp:BoundField DataField="CategoryName" HeaderText="Name"

SortExpression="CategoryName" />

<asp:BoundField DataField="Description" HeaderText="Description" />

<asp:TemplateField HeaderText="# of Products">

<ItemTemplate><%# Item.Products.Count %></ItemTemplate>


</Columns>

<EmptyDataTemplate>No categories found with a product count of

<%# minProductsCount.SelectedValue %></EmptyDataTemplate>

</asp:GridView>

Now when the page runs, the control can make sure that only the current page of data is displayed and

that it’s ordered by the selected column:

7/27/2019 2012 Net 4.5.pdf


To filter the returned data, parameters have to be added to the select method. These parameters will be

populated by the model binding at run time, and you can use them to alter the query before returning the

data.

For example, assume that you want to let users filter products by entering a keyword in the query string.

You can add a parameter to the method and update the code to use the parameter value:

public IQueryable<Product>

GetProducts(string keyword)

{ IQueryable<Product> query = _db.Products;

if (!String.IsNullOrWhiteSpace(keyword))

{

query = query.Where(p => p.ProductName.Contains(keyword));

}

return query;

}

This code includes a Where expression if a value is provided for keyword and then returns the query

results.

Value providers

The previous example was not specific about where the value for the keyword parameter was coming

from. To indicate this information, you can use a parameter attribute. For this example, you can use

the QueryStringAttributeclass that’s in the System.Web.ModelBinding namespace:


GetProducts([QueryString]string keyword)

{

IQueryable<Product> query = _db.Products;


{


}

return query;

}

7/27/2019 2012 Net 4.5.pdf


This instructs model binding to try to bind a value from the query string to the keyword parameter at run

time. (This might involve performing type conversion, although it doesn't in this case.) If a value cannot be

provided and the type is non-nullable, an exception is thrown.

The sources of values for these methods are referred to as value providers, and the parameter attributes

that indicate which value provider to use are referred to as value provider attributes. Web Forms will

include value providers and corresponding attributes for all of the typical sources of user input in a WebForms application, such as the query string, cookies, form values, controls, view state, session state, and

profile properties. You can also write custom value providers.

By default, the parameter name is used as the key to find a value in the value provider collection. In the

example, the code will look for a query-string value named keyword (for example,

~/default.aspx?keyword=chef). You can specify a custom key by passing it as an argument to the

parameter attribute. For example, to use the value of the query-string variable named q, you could do

this:


GetProducts([QueryString("q")]string keyword) {



{


}

return query;

}

If this method is in the page's code, users can filter the results by passing a keyword using the query

string:

Model binding accomplishes many tasks that you would otherwise have to code by hand: reading the

value, checking for a null value, attempting to convert it to the appropriate type, checking whether the

7/27/2019 2012 Net 4.5.pdf


conversion was successful, and finally, using the value in the query. Model binding results in far less code

and in the ability to reuse the functionality throughout your application.

Filtering by values from a control

Suppose you want to extend the example to let the user choose a filter value from a drop-down list. Addthe following drop-down list to the markup and configure it to get its data from another method using

the SelectMethod property:

<asp:Label runat="server" AssociatedControlID="categories"

Text="Select a category to show products for: " />

<asp:DropDownList runat="server" ID="categories"

SelectMethod="GetCategories" AppendDataBoundItems="true"

DataTextField="CategoryName" DataValueField="CategoryID"

AutoPostBack="true">

<asp:ListItem Value="" Text="- all -" />

</asp:DropDownList>

Typically you would also add an EmptyDataTemplate element to the GridView control so that the controlwill display a message if no matching products are found:

<asp:GridView ID="productsGrid"

runat="server" DataKeyNames="ProductID"

AllowPaging="true" AllowSorting="true" AutoGenerateColumns="false"

SelectMethod="GetProducts" >

<Columns>

<asp:BoundField DataField="ProductID" HeaderText="ID" />

<asp:BoundField DataField="ProductName"

HeaderText="Name"

SortExpression="ProductName" />

<asp:BoundField DataField="UnitPrice" HeaderText="Unit Price"

SortExpression="UnitPrice" />

<asp:BoundField DataField="UnitsInStock" HeaderText="# in Stock"

SortExpression="UnitsInStock" />

</Columns>

<EmptyDataTemplate>

No products matching the filter criteria were

found</EmptyDataTemplate>

</asp:GridView>

In the page code, add the new select method for the drop-down list:

public IQueryable<Category>

GetCategories()

{

return _db.Categories;

}

Finally, update the GetProducts select method to take a new parameter that contains the ID of the

selected category from the drop-down list:

7/27/2019 2012 Net 4.5.pdf



GetProducts(

[QueryString("q")] string keyword,

[Control("categories")] int? categoryId)

{



{


}

if (categoryId.HasValue && categoryId > 0)

{

query = query.Where(p => p.CategoryID == categoryId);

}

return query;

}

Now when the page runs, users can select a category from the drop-down list, and the GridView control is

automatically re-bound to show the filtered data. This is possible because model binding tracks the values

of parameters for select methods and detects whether any parameter value has changed after a postback.

If so, model binding forces the associated data control to re-bind to the data.

HTML Encoded Data-Binding ExpressionsYou can now HTML-encode the result of data-binding expressions. Add a colon (:) to the end of the <%#

prefix that marks the data-binding expression:

7/27/2019 2012 Net 4.5.pdf


<asp:TemplateField HeaderText="Name">

<ItemTemplate><%#: Item.Products.Name %></ItemTemplate>


Unobtrusive Validation

You can now configure the built-in validator controls to use unobtrusive JavaScript for client-side

validation logic. This significantly reduces the amount of JavaScript rendered inline in the page markup

and reduces the overall page size. You can configure unobtrusive JavaScript for validator controls in any

of these ways:

Globally by adding the following setting to the <appSettings> element in the Web.config file:

<add name="ValidationSettings:UnobtrusiveValidationMode" value="WebForms" />

Globally by setting the static System.Web.UI.ValidationSettings.UnobtrusiveValidationMode propertytoUnobtrusiveValidationMode.WebForms (typically in the Application_Start method in the Global.asax

file). Individually for a page by setting the new UnobtrusiveValidationMode property of the Page classtoUnobtrusiveValidationMode.WebForms.

HTML5 Updates

Some improvements have been made to Web Forms server controls to take advantage of new features of

HTML5:

The TextMode property of the TextBox control has been updated to support the new HTML5 input

types likeemail, datetime, and so on.

The FileUpload control now supports multiple file uploads from browsers that support this HTML5feature.

Validator controls now support validating HTML5 input elements.

New HTML5 elements that have attributes that represent a URL now support runat="server". As a

result, you can use ASP.NET conventions in URL paths, like the ~ operator to represent the

application root (for example, <video runat="server" src="~/myVideo.wmv" />).

The UpdatePanel control has been fixed to support posting HTML5 input fields.

ASP.NET MVC 4

ASP.NET MVC 4 Beta is now included with Visual Studio 11 Beta. ASP.NET MVC is a framework for

developing highly testable and maintainable Web applications by leveraging the Model-View-Controller

(MVC) pattern. ASP.NET MVC 4 makes it easy to build applications for the mobile Web and includes

ASP.NET Web API, which helps you build HTTP services that can reach any device. For more information,

see the ASP.NET MVC 4 Release Notes.

ASP.NET Web Pages 2

http://www.asp.net/whitepapers/mvc4-release-notes




7/27/2019 2012 Net 4.5.pdf


New features include the following:

New and updated site templates.

Adding server-side and client-side validation using the Validation helper.

The ability to register scripts using an assets manager.

Enabling logins from Facebook and other sites using OAuth and OpenID.

Adding maps using the Maps helper.

Running Web Pages applications side-by-side.

Rendering pages for mobile devices.

For more information about these features and full-page code examples, see The Top Features in Web

Pages 2 Beta.

Visual Web Developer 11 Beta

This section provides information about improvements for web development in Visual Web Developer 11Beta and Visual Studio 2012 Release Candidate.

Project Sharing Between Visual Studio 2010 and Visual

Studio 2012 Release Candidate (Project Compatibility)

Until Visual Studio 2012 Release Candidate, opening an existing project in a newer version of Visual

Studio launched the Conversion Wizard. This forced an upgrade of the content (assets) of a project and

solution to new formats that were not backward compatible. Therefore, after the conversion you could not

open the project in the older version of Visual Studio.

Many customers have told us that this was not the right approach. In Visual Studio 11 Beta, we now

support sharing projects and solutions with Visual Studio 2010 SP1. This means that if you open a 2010

project in Visual Studio 2012 Release Candidate, you will still be able to open the project in Visual Studio

2010 SP1.

Note: A few types of projects cannot be shared between Visual Studio 2010 SP1 and Visual Studio 2012

Release Candidate. These include some older projects (such as ASP.NET MVC 2 projects) or projects for

special purposes (such as Setup projects).

When you open a Visual Studio 2010 SP1 Web project for the first time in Visual Studio 11 Beta, the

following properties are added to the project file:

FileUpgradeFlags

UpgradeBackupLocation

OldToolsVersion

VisualStudioVersion

VSToolsPath

http://go.microsoft.com/fwlink/?LinkID=227824






7/27/2019 2012 Net 4.5.pdf


FileUpgradeFlags, UpgradeBackupLocation, and OldToolsVersion are used by the process that upgrades

the project file. They have no impact on working with the project in Visual Studio 2010.

VisualStudioVersion is a new property used by MSBuild 4.5 that indicates the version of Visual Studio for

the current project. Because this property didn’t exist in MSBuild 4.0 (the version of MSBuild that Visual

Studio 2010 SP1 uses), we inject a default value into the project file.

The VSToolsPath property is used to determine the correct .targets file to import from the path

represented by the MSBuildExtensionsPath32 setting.

There are also some changes related to Import elements. These changes are required in order to support

compatibility between both versions of Visual Studio.

Note: If a project is being shared between Visual Studio 2010 SP1 and Visual Studio 11 Beta on two

different computers, and if the project includes a local database in the App_Data folder, you must make

sure that the version of SQL Server used by the database is installed on both computers.

Configuration Changes in ASP.NET 4.5 WebsiteTemplates

The following changes have been made to the default Web.config file for site that are created using

website templates in Visual Studio 2012 Release Candidate:

In the <httpRuntime> element, the encoderType attribute is now set by default to use the AntiXSS

types that were added to ASP.NET. For details, see AntiXSS Library.

Also in the <httpRuntime> element, the requestValidationMode attribute is set to "4.5". This

means that by default, request validation is configured to use deferred ("lazy") validation. For details,

see New ASP.NET Request Validation Features.

The <modules> element of the <system.webServer> section does not containarunAllManagedModulesForAllRequestsattribute. (Its default value is false.) This means that if

you are using a version of IIS 7 that has not been updated to SP1, you might have issues with routing

in a new site. For more information, see Native Support in IIS 7 for ASP.NET Routing.

These changes do not affect existing applications. However, they might represent a difference in behavior

between existing websites and new websites that you create for ASP.NET 4.5 using the new templates.

Native Support in IIS 7 for ASP.NET Routing

This is not a change to ASP.NET as such, but a change in templates for new website projects that can

affect you if you are working a version of IIS 7 that has not had the SP1 update applied.

In ASP.NET, you can add the following configuration setting to applications in order to support routing:

<configuration>

<system.webServer>

<modules runAllManagedModulesForAllRequests ="true">















7/27/2019 2012 Net 4.5.pdf


</modules>

</system.webServer>

</configuration>

When runAllManagedModulesForAllRequests is true, a URL like http://mysite/myapp/homegoes to

ASP.NET, even though there is no .aspx , .mvc, or similar extension on the URL.

An update that was made to IIS 7 makes the runAllManagedModulesForAllRequests settingunnecessary and supports ASP.NET routing natively. (For information about the update, see the Microsoft

Support article An update is available that enables certain IIS 7.0 or IIS 7.5 handlers to handle requests

whose URLs do not end with a period.)

If your website is running on IIS 7 and if IIS has been updated, you do not need to

setrunAllManagedModulesForAllRequests to true. In fact, setting it to true is not recommended,

because it adds unnecessary processing overhead to request. When this setting is true, all requests,

including those for .htm, .jpg, and other static files, also go through the ASP.NET request pipeline.

If you create a new ASP.NET 4.5 website using the templates that are provided in Visual Studio 2012 RC,

the configuration for the website does not include the runAllManagedModulesForAllRequests setting.

This means that by default the setting is false.

If you then run the website on Windows 7 without SP1 installed, IIS 7 will not include the required update.As a consequence, routing will not work and you will see errors. If you have a problem where routing does

not work, you can do either the following:

Update Windows 7 to SP1, which will add the update to IIS 7.

Install the update that's described in the Microsoft Support article listed previously.

Set runAllManagedModulesForAllRequests to true in that website's Web.config file. Note that this

will add some overhead to requests.

HTML Editor

Smart Tasks

In Design view, complex properties of server controls often have associated dialog boxes and wizards to

make it easy to set them. For example, you can use a special dialog box to add a data source to

a Repeater control or add columns to a GridView control.

However, this type of UI help for complex properties has not been available in Source view. Therefore,

Visual Studio 11 introduces Smart Tasks for Source view. Smart Tasks are context-aware shortcuts for

commonly used features in the C# and Visual Basic editors.

For ASP.NET Web Forms controls, Smart Tasks appear on server tags as a small glyph when the insertion

point is inside the element:

The Smart Task expands when you click the glyph or press CTRL+. (dot), just as in the code editors. It then

displays shortcuts that are similar to the Smart Tasks in Design view.







7/27/2019 2012 Net 4.5.pdf


For example, the Smart Task in the previous illustration shows the GridView Tasks options. If you choose

Edit Columns, the following dialog box is displayed:

Filling in the dialog box sets the same properties you can set in Design view. When you click OK, the

markup for the control is updated with the new settings:

7/27/2019 2012 Net 4.5.pdf


WAI-ARIA support

Writing accessible websites is becoming increasingly important. The WAI-ARIA accessibility

standard defines how developers should write accessible websites. This standard is now fully supported in

Visual Studio.For example, the role attribute now has full IntelliSense:

The WAI-ARIA standard also introduces attributes that are prefixed with aria- that let you add semantics

to an HTML5 document. Visual Studio also fully supports these aria- attributes:

http://www.w3.org/WAI/intro/aria






7/27/2019 2012 Net 4.5.pdf


New HTML5 snippets

To make it faster and easier to write commonly used HTML5 markup, Visual Studio includes a number of

snippets. An example is the video snippet:

To invoke the snippet, press Tab twice when the element is selected in IntelliSense:

This produces a snippet that you can customize.

Extract to user control

In large web pages, it can be a good idea to move individual pieces into user controls. This form of

refactoring can help increase the readability of the page and can simplify the page structure.

To make this easier, when you edit Web Forms pages in Source view, you can now select text in a page,

right-click it, and then choose Extract to User Control:

7/27/2019 2012 Net 4.5.pdf


IntelliSense for code nuggets in attributes

Visual Studio has always provided IntelliSense for server-side code nuggets in any page or control. Now

Visual Studio includes IntelliSense for code nuggets in HTML attributes as well.

This makes it easier to create data-binding expressions:

7/27/2019 2012 Net 4.5.pdf


Automatic renaming of matching tag when you rename an opening or

closing tagIf you rename an HTML element (for example, you change a div tag to be a header tag), the

corresponding opening or closing tag also changes in real time.

This helps avoid the error where you forget to change a closing tag or change the wrong one.

Event handler generation

Visual Studio now includes features in Source view to help you write event handlers and bind them

manually. If you are editing an event name in Source view, IntelliSense displays <Create New Event>,

which will create an event handler in the page's code that has the right signature:

By default, the event handler will use the control's ID for the name of the event-handling method:

The resulting event handler will look like this (in this case, in C#):

7/27/2019 2012 Net 4.5.pdf


Smart indent

When you press Enter while inside an empty HTML element, the editor will put the insertion point in the

right place:

If you press Enter in this location, the closing tag is moved down and indented to match the opening tag.

The insertion point is also indented:


The IntelliSense list in Visual Studio now filters based on what you type so that it displays only relevant

options:

IntelliSense also filters based on the title case of the individual words in the IntelliSense list. For example, if

you type "dl", both dl and asp:DataList are displayed:

This feature makes it faster to get statement completion for known elements.

JavaScript Editor

7/27/2019 2012 Net 4.5.pdf


The JavaScript editor in Visual Studio 2012 Release Candidate is completely new and it greatly improves

the experience of working with JavaScript in Visual Studio.

Code outlining

Outlining regions are now automatically created for all functions, allowing you to collapse parts of the filethat aren’t pertinent to your current focus.

Brace matching

When you put the insertion point on an opening or closing brace, the editor highlights the matching one.

Go to Definition

The Go to Definition command lets you jump to the source for a function or variable.

ECMAScript5 supportThe editor supports the new syntax and APIs in ECMAScript5, the latest version of the standard that

describes the JavaScript language.

DOM IntelliSense

IntelliSense for DOM APIs has been improved, with support for many new HTML5 APIs

including querySelector , DOM Storage, cross-document messaging, and canvas. DOM IntelliSense is now

driven by a single simple JavaScript file, rather than by a native type library definition. This makes it easy

to extend or replace.

VSDOC signature overloadsDetailed IntelliSense comments can now be declared for separate overloads of JavaScript functions by

using the new <signature> element, as shown in this example:

function GetOrSet(key, value) {

/// <signature>

/// <summary>Gets the value</summary>

/// <param name="key" type="String">The key to get the value for</param>

/// <returns type="String" />

/// </signature>

/// <signature>

/// <summary>Sets the value</summary>

/// <param name="key" type="String">The key to set the value for</param>

/// <param name="value" type="String">The value to set</param>

/// <returns type="MyLib" />

/// </signature>

if (value) {

values[key] = value;

return this;

7/27/2019 2012 Net 4.5.pdf


} else {

return values[key];

}

}

Implicit references

You can now add JavaScript files to a central list that will be implicitly included in the list of files that any

given JavaScript file or block references, meaning you’ll get IntelliSense for its contents. For example, you

can add jQuery files to the central list of files, and you’ll get IntelliSense for jQuery functions in any

JavaScript block of file, whether you’ve referenced it explicitly (using /// <reference />) or not.

CSS Editor


The IntelliSense list for CSS now filters based on the CSS properties and values supported by the selectedschema.

IntelliSense also supports title case searches:

Hierarchical indentation

The CSS editor uses indentation to display hierarchical rules, which gives you an overview of how the

cascading rules are logically organized. In the following example, the #list a selector is a cascading child of

list and is therefore indented.

7/27/2019 2012 Net 4.5.pdf


The following example shows more complex inheritance:

The indentation of a rule is determined by its parent rules. Hierarchical indentation is enabled by default,

but you can disable it the Options dialog box (Tools, Options from the menu bar):

7/27/2019 2012 Net 4.5.pdf


CSS hacks support

Analysis of hundreds of real-world CSS files shows that CSS hacks are very common, and now Visual

Studio supports the most widely used ones. This support includes IntelliSense and validation of the star (*)

and underscore (_) property hacks:

Typical selector hacks are also supported so that hierarchical indentation is maintained even when they

are applied. A typical selector hack used to target Internet Explorer 7 is to prepend a selector with *:first-

child + html. Using that rule will maintain the hierarchical indentation:

7/27/2019 2012 Net 4.5.pdf


Vendor specific schemas (-moz-, -webkit)

CSS3 introduces many properties that have been implemented by different browsers at different times.

This previously forced developers to code for specific browsers by using vendor-specific syntax. These

browser-specific properties are now included in IntelliSense.

Commenting and uncommenting support

You can now comment and uncomment CSS rules using the same shortcuts that you use in the code

editor (Ctrl+K,C to comment and Ctrl+K,U to uncomment).

Color picker

In previous versions of Visual Studio, IntelliSense for color-related attributes consisted of a drop-down list

of named color values. That list has been replaced by a full-featured color picker.

When you enter a color value, the color picker is displayed automatically and presents a list of previously

used colors followed by a default color palette. You can select a color using the mouse or the keyboard.

7/27/2019 2012 Net 4.5.pdf


The list can be expanded into a complete color picker. The picker lets you control the alpha channel by

automatically converting any color into RGBA when you move the opacity slider:

Snippets

Snippets in the CSS editor make it easier and faster to create cross-browser styles. Many CSS3 properties

that require browser-specific settings have now been rolled into snippets.

7/27/2019 2012 Net 4.5.pdf


CSS snippets support advanced scenarios (like CSS3 media queries) by typing the at-symbol (@), which

shows the IntelliSense list.

When you select @media value and press Tab, the CSS editor inserts the following snippet:

As with snippets for code, you can create your own CSS snippets.

Custom regions

Named code regions, which are already available in the code editor, are now available for CSS editing.

This lets you easily group related style blocks.

7/27/2019 2012 Net 4.5.pdf


When a region is collapsed it displays the name of the region:

Page Inspector

Page Inspector is a tool that renders a web page (HTML, Web Forms, ASP.NET MVC, or Web Pages) in the

Visual Studio IDE and lets you examine both the source code and the resulting output. For ASP.NET

pages, Page Inspector lets you determine which server-side code has produced the HTML markup that is

rendered to the browser.

7/27/2019 2012 Net 4.5.pdf


For more information about Page Inspector, see the Page Inspector Release Notes.

Publishing

Publish profiles

In Visual Studio 2010, publishing information for Web application projects is not stored in version control

and is not designed for sharing with others. In Visual Studio 2012 Release Candidate, the format of the

publish profile has been changed. It has been made a team artifact, and it is now easy to leverage from

builds based on MSBuild. Build configuration information is in the Publish dialog box so that you can

easily switch build configurations before publishing.

Publish profiles are stored in the PublishProfiles folder. The location of the folder depends on what

programming language you are using:

C#: Properties\PublishProfiles

Visual Basic: My Project\PublishProfilesEach profile is an MSBuild file. During publishing, this file is imported into the project's MSBuild file. In

Visual Studio 2010, if you want to make changes to the publish or package process, you have to put your

customizations in a file named ProjectName.wpp.targets. This is still supported, but you can now put

your customizations in the publish profile itself. That way, the customizations will be used only for that

profile.

You can now also leverage publish profiles from MSBuild. To do so, use the following command when you

build the project:

http://go.microsoft.com/fwlink/?LinkId=245529




7/27/2019 2012 Net 4.5.pdf


msbuild.exe project.csproj /t:WebPublish /p:PublishProfile=ProfileName

The project.csproj value is the path of the project, and ProfileName is the name of the profile to publish.

Alternatively, instead of passing the profile name for the PublishProfile property, you can pass in the full

path to the publish profile.

ASP.NET precompilation and mergeFor Web application projects, Visual Studio 2012 Release Candidate adds an option on the

Package/Publish Web properties page that lets you precompile and merge your site's content when you

publish or package the project. To see these options, right-click the project in Solution Explorer, choose

Properties, and then choose the Package/Publish Web property page. The following illustration shows the

Precompile this application before publishing option.

When this option is selected, Visual Studio precompiles the application whenever you publish or package

the web application. If you want to control how the site is precompiled or how assemblies are merged,

click the Advanced button to configure those options.

IIS Express

The default web server for testing web projects in Visual Studio is now IIS Express. The Visual Studio

Development Server is still an option for local web server during development, but IIS Express is now the

recommended server. The experience of using IIS Express in Visual Studio 11 Beta is very similar to using it

in Visual Studio 2010 SP1.

DisclaimerThis is a preliminary document and may be changed substantially prior to final commercial release of the

software described herein.

The information contained in this document represents the current view of Microsoft Corporation on the

issues discussed as of the date of publication. Because Microsoft must respond to changing market

7/27/2019 2012 Net 4.5.pdf


conditions, it should not be interpreted to be a commitment on the part of Microsoft, and Microsoft

cannot guarantee the accuracy of any information presented after the date of publication.

This White Paper is for informational purposes only. MICROSOFT MAKES NO WARRANTIES, EXPRESS,

IMPLIED OR STATUTORY, AS TO THE INFORMATION IN THIS DOCUMENT.

Complying with all applicable copyright laws is the responsibility of the user. Without limiting the rights

under copyright, no part of this document may be reproduced, stored in or introduced into a retrieval

system, or transmitted in any form or by any means (electronic, mechanical, photocopying, recording, or

otherwise), or for any purpose, without the express written permission of Microsoft Corporation.

Microsoft may have patents, patent applications, trademarks, copyrights, or other intellectual property

rights covering subject matter in this document. Except as expressly provided in any written license

agreement from Microsoft, the furnishing of this document does not give you any license to these

patents, trademarks, copyrights, or other intellectual property.

Unless otherwise noted, the example companies, organizations, products, domain names, e-mail

addresses, logos, people, places and events depicted herein are fictitious, and no association with any real

company, organization, product, domain name, email address, logo, person, place or event is intended or

should be inferred.

© 2012 Microsoft Corporation. All rights reserved.

Microsoft and Windows are either registered trademarks or trademarks of Microsoft Corporation in the

United States and/or other countries.

The names of actual companies and products mentioned herein may be the trademarks of their respective

owners.

By Microsoft ASP.NET Team, ASP.NET is a free web framework for building

great Web sites and Web applications using HTML, CSS and JavaScript.

2012 Net 4.5.pdf

Documents