CSC 157 (Blum)1 Hello World. CSC 157 (Blum)2 Start/Programs/Microsoft Visual Studio.NET 2003/Microsoft Visual Studio.NET 2003.

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Hello World

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Start/Programs/Microsoft Visual Studio .NET 2003/Microsoft Visual Studio .NET 2003

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Start Page Tabs: My Profile

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Start Page Tabs: Projects

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New Project Dialog Box

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Name the Project

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Browse for a Location

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Use Look in Drop-down box to select a location for your project

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Click on the Create New Folder button to make a folder for your project

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Enter a Name in the New Folder Dialog Box

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Click Open

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Click OK

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Designing a Form

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Place the mouse over the Toolbox icon to display the Toolbox

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Click on the tack icon to display the Toolbox continually

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Change the programming name of the form by editing the text in the (Name) textbox in

the Properties Window

Properties Window

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Right click on the Form icon in the Solution Explorer and choose Rename

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Here we are changing the name of the file that contains the code we will write. It is tradition for

it to have the same name as the Form (class).

Solution Explorer

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Right click on project icon in the Solution Explorer and choose Properties.

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Find the newly named file in the Startup object drop-down list, then click OK.

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Click on the form in the design tabpage to bring back

its Properties Window, then edit the Text property.

The form in design.

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Form

• The form is like a window.

• Think of it as a container of the other items belongs to your graphical user interface (GUI). – Technical point: we are creating a form class,

usually one must instantiate a specific object of a generic class. But if there is only one form this is done automatically for you.

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A look at what has been generated thus far in Windows Explorer

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Click on the Button icon in the toolbox

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Drag the cursor (it should appear as the button icon and cross hairs) from the upper left to the lower right of the desired position of the button

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Change the button’s (Name) property in the Properties Window

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Controls and Hungarian Notation

• The button is our first example of a control. Controls are the items placed on a form (usually visible) with which the user interacts.

• Visual Basic programming typically uses a notation scheme known as Hungarian Notation for naming controls. – The names of controls start with a prefix that describes

the type of control. – The rest of the control’s name hints at its purpose in the

program. • The first letter of the second part of the name is capitalized.

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Edit the textbox corresponding to the Text property of the button.

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Click on the Label icon in the toolbox

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Drag the cursor from the upper left to the lower right of the desired position of the label

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Change the label’s (Name) property in the Properties Window – the Hungarian prefix for label is lbl

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Click on the ellipsis button for the font dialog box

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Use the Font dialog box to change the font size and click OK

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Clear out the text property of the label

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Double click on the Message button

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This open up a FrmHello code tabpage and provides the first and last line of the btnMessage_Click method

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Event Driven Programming

• We are writing event-driven code. • An error is when something happens.

Examples include: – The user clicking a button– The program clock reaching a certain value – The system running out of memory allotted to

the program– Etc.

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Inside the button’s click event method, start entering the code that will display a message. Type the name of the label and a dot.

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Typing the dot should yield a drop-down list of label properties and methods, double click on the text property.

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Finish typing the assignment statement.

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Assignment statements

• Assignment statements direct the computer to evaluate the right-hand side and then to set the value of the property on the left-hand side to that value.

• The right-hand side of the statement in this case is a literal string – that “Hello World”

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Add comments. Comments start with an apostrophe. They do not affect the way the program executes,

but help someone to read the code.

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Click on Build/Build Solution

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Click Debug/Start

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The executing program prior to the user’s clicking the button.

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The executing program after the user’s clicking the button.

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Close the program by clicking the button