Beginning Web Development, Silverlight, and ASP.NET AJAX

CHAPTER 3 ■ WEB FORMS WITH ASP.NET 65
Figure 3-8. Adding a list dynamically
You would then create an event-handler function. This function takes a parameter,
sender, which is a generic object that you can then cast to get the list box. Now that you
have a list box, you have full IntelliSense in development so that you can handle it. Here’s
an example:
protected void newListBox_SelectedIndexChanged(object sender, EventArgs e)
{
ListBox theBox = (ListBox)sender;
String strTest = theBox.SelectedItem.Text;
}