ASP.NET Page does't show code behind code when clicking on Design code
<p>Page does't show code behind code when clicking on Design code  and also code behind code display error as control not found</p>

<p>Below code display error : System Error </p>

<pre><code>&lt;%@Page Language="C#" AutoEventWireup="true" CodeFile="Register.aspx.cs" Inherits="Register" %&gt;
</code></pre>

<p>I don't why it fetches this type of error ,please help me </p>

<p>Code Behind:</p>

<pre><code>using System;
</code></pre>
