title: Which control caused the postback?
body: <p>I have two buttons:</p>
  
  <pre><code>&lt;asp:Button ID="Button1" runat="server" Text="Button" /&gt;
  &lt;asp:Button ID="Button2" runat="server" Text="Button" /&gt;
  </code></pre>
  
  <p>How can I determine on pageLoad which one of this two caused the postback?
  Is there a short solution as I know there are only two controls that can cause this postback?</p>