This exercise, you add a TextBox, a Label, and a Button control to a page. When you request the page in the browser, these server controls are transformed into HTML, which is then sent to the client. looking at the final HTML for the page in the browser, you'll see how the HTML is completely different from the initial ASP.NET markup.
1. Open the Planet Wrox project in Visual Web Developer.
2. In the Demos folder in the Solution Explorer, create a new Web Form called ControlsDeno. aspx. Choose your programming language and make sure the Web Form uses Code Behind.
3. Switch to Design View. From the Toolbox, drag a TextBox, a Button, and a Label control onto the design surface within the dashed lines of the tag that was added for you when you created the page.
4. Right-click the Button and choose Properties to open up the Properties Grid for the control. Pressing F4 after selecting the Button does the same thing. The window that appears, shown in Figure 4-2, enables you to change the properties for the control, which in turn influence the way the control behaves at runtime.
5. Set the control's Text property to submit xnformatson and set its In (which you'll find all the way down at the bottom of the list wrapped in parentheses) to surraitBut ton.
6. Change the ID of the textftox to YourName using the Properties Grid.
7. Clear the Text property of the Label using the Properties Grid. You can right-click the property' label in the grid and choose Reset, or you can manually remove the text. You can leave its ID set to Labell.
8. Still in Design View, double-click the button to have VWD add some code to the Code Behind of the page that will be fired when the button is clicked in the browser. Add the bolded line of code the code block that VWD Inserted for you:
VB.NET
Protected Sub SUbmitButton_Click(ByVal sender As Object,
ByVal a As System.EventArgs) Handles SubmitButton.Click
Labell.Text ="your name is + & YourName.Text;
End Sub
CO
protected void SubmitButton_Click(object sender. EventArgs e)
{
labell.Text =" your name is " = YourName.Text;
}
Note that the VB.NET example doesn't need an underscore here to split the code over two lines. In previous versions of VB.NET the underscore was required to split this code over two lines.
9. Save the changes to the page and then open it in the browser by pressing Ctrl+F5. When it appears in the browser, don't click the button yet, but open up the source of the page by right-clicking the
page in the browser and choosing View Source or View Page Source. You should see the following HTML code Cl changed the formatting slightly so the HTML fits on the page):