Find Postback Control ID in Asp.net c#

string controlID = Page.Request.Params["__EVENTTARGET"];
Control postbackControl = null;
 if (controlID != null && controlID != String.Empty)
  {
     postbackControl = Page.FindControl(controlID);
  }
 else
  {
     foreach (string ctrl in Page.Request.Form)
      {    //Check if Image Button
        if (ctrl.EndsWith(".x") || ctrl.EndsWith(".y"))
          {
            postbackControl = Page.FindControl(ctrl.Substring(0, ctrl.Length - 2));
            break;
          }
        else
          {
            postbackControl = Page.FindControl(ctrl);
            //Check if Button control    
            if (postbackControl is Button)
               {
                  break;
               }
           }
       }
   }
 Response.Write(postbackControl.ID);