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Asked: 2026-05-10T15:27:19+00:00

We have some legacy code that needs to identify in the Page_Load which event

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We have some legacy code that needs to identify in the Page_Load which event caused the postback. At the moment this is implemented by checking the Request data like this…

if (Request.Form[‘__EVENTTARGET’] != null
&& (Request.Form[‘__EVENTTARGET’].IndexOf(‘BaseGrid’) > -1 // BaseGrid event ( e.g. sort)
       || Request.Form[‘btnSave’] != null // Save button

This is pretty ugly and breaks if someone renames a control. Is there a better way of doing this?

Rewriting each page so that it does not need to check this in Page_Load is not an option at the moment.

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1 Answer

  1. This should get you the control that caused the postback:

    public static Control GetPostBackControl(Page page) {     Control control = null;      string ctrlname = page.Request.Params.Get('__EVENTTARGET');     if (ctrlname != null && ctrlname != string.Empty)     {         control = page.FindControl(ctrlname);     }     else     {         foreach (string ctl in page.Request.Form)         {             Control c = page.FindControl(ctl);             if (c is System.Web.UI.WebControls.Button)             {                 control = c;                 break;             }         }     }     return control; }

    Read more about this on this page: http://ryanfarley.com/blog/archive/2005/03/11/1886.aspx

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