title: Perform Button click event when user press Enter key in Textbox
body: <pre><code>&lt;asp:UpdatePanel ID="UpdatePanel1" runat="server" UpdateMode="Conditional"&gt;
  &lt;ContentTemplate&gt;
  &lt;asp:TextBox ID="TextBox1" runat="server"&gt;&lt;/asp:TextBox&gt;
  &lt;asp:Button ID="Button1" runat="server" onclick="Button1_Click" Text="Send" /&gt;
  &lt;/ContentTemplate&gt;
  &lt;/asp:UpdatePanel&gt;
  </code></pre>
  
  <p>I have to perform <code>Button1</code> click event when user press <code>Enter key</code> in <code>Textbox1</code></p>