How to know which button clicked using this.Request.Form
<p>I am using .net 1.1 In My page,i have few <code>ImageButtonClientSide</code> Controls and some other buttons which causes <code>postback.Now</code> I want to know,when page postbacks,In <code>Page_Load</code> which control has been clicked?I am currently doing like this </p>

<pre><code>  if ( Check.IsNotNulOrBlank(this.Request.Form["__EVENTTARGET"]) ) 
 {
            if(this.Request.Form["__EVENTTARGET"].Equals("imgButtonSearch"))

            {

                                  }
  }
</code></pre>

<p>But <code>this.Request.Form["__EVENTTARGET"]</code> is showing empty values.</p>
