C# - Understanding the Page.IsPostBack

Gets a value that indicates whether the page is being rendered for the first time or is being loaded in response to a postback.

The IsPostBack property can be used to determine if the page is submitted to itself. When a form is submitted back to the same page that contains it, it's called a post back. ASP.NET provides a property called IsPostBack that is TRUE when the page is being loaded as a result of a post back, and is FALSE otherwise.

     protected void Page_Load(object sender, EventArgs e)

     {

         if (!IsPostBack)

         {               

            //You can write here the code, which you want to

                          //execute in the first time when the page is loaded.

         }           

     }