title: How to know the target control for postback in asp.net
body: <p>First Page</p>
  
  <pre><code>&lt;html &gt;
  &lt;head &gt;
  &lt;/head&gt;
  &lt;body&gt;
  &lt;form id="form1" runat="server"&gt;
  
  &lt;asp:Button ID="btnSubmit" runat="server" 
              OnClick="btnSubmit_Click"            
              Text="Submit to Second Page" /&gt;
  &lt;/div&gt;
  &lt;/form&gt;
  &lt;/body&gt;
  </code></pre>
  
  <p>btnSubmit_Click Event</p>
  
  <pre><code>Response.redirect("Page2.aspx");
  </code></pre>
  
  <p>In the Page Load of Page2, how to find which button causes postback?</p>