IsPostBack Property in asp.net

The Page_Load ( )subroutine runs EVERY time the page is loaded. If you want to execute the code in the Page_Load( ) subroutine only the FIRST time the page is loaded, you can use the Page.IsPostBack property. If the Page.IsPostBack property is false, the page is loaded for the first time, if it is true; the page is posted back to the server (i.e. from a button click on a form)