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What Is ASP.NET
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You can also insert Trace statements into your application. For example, in the following code I have inserted two Trace statements: one to display a warning when the user did not enter a string for the TextBox control, and another to simply display the contents of the TextBox control:


    Protected Sub Button1_Click( _
       ByVal sender As Object, _
       ByVal e As System.EventArgs) _
       Handles Button1.Click
        If TextBox1.Text = "" Then
            Trace.Warn("Empty string for textbox1")
        Else
            Trace.Write(TextBox1.Text)
        End If
        Label1.Text = "Hello  " & TextBox1.Text
    End Sub

When run, notice the red warning text (see Figure 7) when the button is clicked.

Figure 7
Figure 7. Displaying a warning message in red

But if you type some text into the TextBox control, the trace message will be printed in black (see Figure 8).

Figure 8
Figure 8. Displaying trace information

The nice feature about the Trace class is that when it comes to time to deploy the application, you can simply turn off tracing by setting the Trace attribute to "off;" there is no need for you to remove the trace statements.

Besides tracing, you also have the ability to step through the execution of your application code. Figure 9 shows that you can perform debugging on an ASP.NET web application in real time.

Figure 9
Figure 9. Debugging an ASP.NET application using Visual Studio

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