Use the Page.IsPostBack property to ensure that you only perform page initialization logic when a page is first loaded and not in response to client postbacks. The following code fragment shows how to use the Page.IsPostBack property.

Listing 8

if (!Page.IsPostBack) //IsPostBack property will be false for the first time
{
  //load the dataset for the first time
}
else               
{
  //use the loaded dateset for other post back requests
}