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Asked: 2026-05-27T00:43:18+00:00

Any ideas how to check which control in an asp.net web application raised a

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Any ideas how to check which control in an asp.net web application raised a postback?

I have a number of buttons, and want to perform a different task in the Page_Load method depending which button was clicked.

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  1. Editorial Team

    To check which control caused the postback, use Request.Form["__EVENTTARGET"]. This should return a unique ID of the control that caused the postback.

    EDIT
    For this to work you will have to set UseSubmitBehavior property of the button to false which causes it to use Asp Net post back mechanism

    Use the UseSubmitBehavior property to specify whether a Button control uses the client browser’s submit mechanism or the ASP.NET postback mechanism. By default the value of this property is true, causing the Button control to use the browser’s submit mechanism. If you specify false, the ASP.NET page framework adds client-side script to the page to post the form to the server.

    When the UseSubmitBehavior property is false, control developers can use the GetPostBackEventReference method to return the client postback event for the Button. The string returned by the GetPostBackEventReference method contains the text of the client-side function call and can be inserted into a client-side event handler.

    From MSDN

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