When you’re working with ASP.NET pages, be sure you understand the page events just listed. They are important because you place a lot of your page behavior inside these events at specific points in a page lifecycle.
In Active Server Pages 3.0, developers had their pages post to other pages within the application. ASP.NET pages typically post back to themselves in order to process events (such as a button-click event).
For this reason, you must differentiate between posts for the first time a page is loaded by the end user and postbacks. A postback is just that - a posting back to the same page. The postback contains all the form information collected on the initial page for processing if required.
Because of all the postbacks that can occur with an ASP.NET page, you want to know whether a request is the first instance for a particular page or is a postback from the same page. You can make this check by using the IsPostBack property. like.
if (!Page.IsPostBack)
{
// Do processing in page
}
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