title: How to access id of <asp:Hidden> control from ascx page to cs page
body: <p>This is my <em>ascx</em> Code:</p>
  
  <pre><code>&lt;%@ Control Language="C#" AutoEventWireup="true" CodeFile="Demo.ascx.cs"
              Inherits="Demo" %&gt;
  &lt;asp:HiddenField ID="hidden" runat="server" Value="" /&gt;
  </code></pre>
  
  <p>And the <em>aspx</em>:</p>
  
  <pre><code>&lt;%@ Register TagName="Hidden" TagPrefix="CRS" Src="~/Demo.ascx" %&gt;
  
  &lt;div&gt;
     &lt;CRS:Hidden ID="hid" runat="server" /&gt;
  &lt;/div&gt;
  </code></pre>
  
  <p>Now How to access Hidden variable ID From ascx page to this cs page backend</p>