How to Identify Postback event in Page_Load

Question

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...

Answer 1

I am just posting the entire code (which includes the image button / additional control check that causes postback). Thanks Espo.

public 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; }
           }
       }
// handle the ImageButton postbacks 
if (control == null) 
{ for (int i = 0; i < page.Request.Form.Count; i++) 
    { 
        if ((page.Request.Form.Keys[i].EndsWith(".x")) || (page.Request.Form.Keys[i].EndsWith(".y"))) 
             { control = page.FindControl(page.Request.Form.Keys[i].Substring(0, page.Request.Form.Keys[i].Length - 2)); break; 
             }
     }
 } 
return control; 
}