<p>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...</p>

<p>if (Request.Form["__EVENTTARGET"] != null<br>
&amp;&amp; (Request.Form["__EVENTTARGET"].IndexOf("BaseGrid") > -1 // BaseGrid event ( e.g. sort)<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;|| Request.Form["btnSave"] != null            // Save button </p>

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

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

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