My ASP.NET site doesn't find files located in different folders
<p>My website has many pages which operate on some data  in a database. Since many procedures are the same, I have put all of these "general" functions inside a (public partial) static class and saved it in the App_Code folder as suggested by Visual Studio:</p>

<pre><code>Root
 |
 +-- App_Code
 |       |
 |       +-- GeneralStuff.cs
 |       |
 |       +-- DataStructure.cs
 |
 +-- Default.aspx
 |
 +-- Default.aspx.cs
 |
 +-- etc
</code></pre>

<p>The problem is that whenever I try to use something defined inside my GeneralStuff class the page doesn't compile because it can't find that class:</p>

<pre><code>Compiler Error Message: CS0103: The name 'GeneralStuff' does not exist in the current context
</code></pre>

<p>I can't also use the files that are saved in the App_Data folder. Note that everything works fine when running from Visual Studio.  </p>

<p><strong>Additional details:</strong> Here's the version I'm using:<br>
 - Microsoft .NET Framework Version:2.0.50727.3625;<br>
 - ASP.NET Version:2.0.50727.3634;  </p>

<p>Any hints?  </p>

<p>Cheers</p>
