How to use IsPostBack property in ASP.NET pages to determine if the page is posted back Samples and examples

In ASP.Net, the Page Load is event is fired every time a page is loaded. This is true even if the page is loaded as part of a submit button click. You may need to identify if the page load event is called as part of a page submit or if it is a fresh page rendering. Because, in case of page submit, you may want to skip several task like populating the data again etc.

The IsPostBack property can be used to determine if the page is submitted to itself. When a form is posted (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.

We can check the value of this property and based on the value, we can populate the controls in the page. If the property is TRUE, that means it is a postback (submit) and no need to populate all the values again.

Sample


Sub Page_Load
         IF Not IsPostBack THEN
                            ' Need to do load the grid only if it is first time load.
                            grdtest.DataSource = Session("dS")
                            grdtest.DataBind()
          END IF
End Sub

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How to use IsPostBack property in ASP.NET pages to determine if the page is posted back

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