How to detect which control caused 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)
            {
               if ((ctl.LastIndexOf(".x") > 0) || (ctl.LastIndexOf(".y") > 0))
                {
                    control = page.FindControl(ctl.Substring(0, ctl.Length - 2));
                    break;
                }
                control = page.FindControl(ctl);  
                if ((control is System.Web.UI.WebControls.Button))
                {
                    break;
                }
             }
          }
        return control;
        }

 

using  System;
using  System.Collections;
using  System.Configuration;
using  System.Data;
using  System.Linq;
using  System.Web;
using  System.Web.Security;
using  System.Web.UI;
using  System.Web.UI.HtmlControls;
using  System.Web.UI.WebControls;
using  System.Web.UI.WebControls.WebParts;
using  System.Xml.Linq;

public   partial   class  WebUserControl : System.Web.UI.UserControl
{
    protected void Page_Load(object sender, EventArgs e)
    {
        if (IfInThisControl(this))
        {
            Label1.Text = DateTime.Now.ToString();
        }
    }

    public static bool IfInThisControl(Control theControl)
    {
        string ctrlname = theControl.Page.Request.Params.Get("__EVENTTARGET");

        if (ctrlname != null && ctrlname != string.Empty)
        {
            if (ctrlname.StartsWith(theControl.ClientID) || ctrlname.StartsWith(theControl.UniqueID))
                return true;
            else
                return false;
        }
        else
        {
            foreach (string ctl in theControl.Page.Request.Form)
            {
                if (ctl != null)
                {
                    Control c = theControl.Page.FindControl(ctl);
                    if (c is Button && (c.ClientID.StartsWith(theControl.ClientID) || c.ClientID.StartsWith(theControl.UniqueID)))
                    {
                        return true;
                    }
                }
            }
        }
        return false;
    }

    protected void Timer1_Tick(object sender, EventArgs e)
    {
        Label2.Text = DateTime.Now.ToString();
    }
}