Inserting a text box into the markup

Let's begin with Default.aspx, as shown in the following screenshot, and then we will drag in a text box:

Figure 2.9.1: Our Default.aspx starting point for this chapter

To open the toolbox, go to View | Toolbox (Ctrl+Alt+X). Then, type tex into the Search box, and drag TextBox into the markup, as shown in the following screenshot:

Figure 2.9.2: TextBox is inserted into the markup

Remember, all that appears in Default.aspx is called markup.

Entering your C# code

In the next stage, we'll switch to the Design View, and see that there's a box and it's a label, as shown in the following screenshot:

 

Figure 2.9.3: In the Design view, you see the box here and the label

Double-click on the box and that brings up a stub, as shown in the following code block. This is where we put our C#:

protected void TextBox1_TextChanged(object sender, EventArgs e)
{
}

Now, if you go back to the Source View for a second, it says OnTextChanged = and then the name of the TextBox1_TextChanged...