C# .NET 2013 can't find Class

I am migrating a website (.NET 2008) to a web application (.NET 2013).  I am having an issue where I have a class in the App_Code folder that used all over the place and now it can't find it.  I believe it is because of the new structure folder structure.

I created the web app in .NET 2013 then copied the website to the directory in the 2013 directory and included the files per instructions I found on the web.

As an example of the current directory structure in Solution Explorer.

MyNewApp(1)
- MyNewApp
  -  App_Code
     - AppClass.cs

using System;
using System.ComponentModel;
using System.Collections.Generic;
using System.Collections;
using System.Diagnostics;
using System.Data;
using System.Data.SqlClient;

namespace PremiumAdmin
{
	public class AppClass : System.ComponentModel.Component
	{
		/// <summary>
		/// Required designer variable.
		/// </summary>
		private System.ComponentModel.Container components = null;

		protected string sConnectionString;
		protected short iUserID;
		protected string sLastError;

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using System;
using System.Data;
using System.Data.SqlClient;
using System.Web;
using System.Web.UI.WebControls;
using PremiumAdmin;  //Having issues resolving here

public partial class baseFrame : System.Web.UI.MasterPage
{
    protected AppClass appClass = (AppClass)HttpContext.Current.Session["appClass"];  //Having issues resolving here
    public delegate void attachDocumentDelegate(int iDoc);
    public attachDocumentDelegate attachDocument;

    protected void Page_Load(object sender, System.EventArgs e)
    {
        pnlHeaderMenu.Visible = true;
    }

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Error I'm receiving now.
The type or namespace name 'AppClass' could not be found (are you missing a using directive or an assembly reference?)      

ANy ideas how to resolve?
LVL 2
CipherISAsked:
Who is Participating?
 
käµfm³d 👽Commented:
Generally speaking, App_Code isn't used in Web Application projects. Are you intending on having dynamic compilation in your Web Application, or do you simply want to compile the code like you normally would in a Web Application? If it's the latter, then make sure the Build Action of your .cs files is set to "Compile".
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Seven priceFull StackCommented:
Not really. that is a big jump. most applications if you are using 2013 have to be upgraded to at least 4.0.  Its best to create a new application and move over the files one by one. if it was 2010 to 2013 the migration would of been much easier.  Sorry.
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Seven priceFull StackCommented:
Try this PremiumAdmin.Appclass
protected AppClass appClass = (PremiumAdmin.AppClass)
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David Johnson, CD, MVPOwnerCommented:
in the project references add a reference to your class
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Seven priceFull StackCommented:
that was to simple David Johnson. that could be the case but not most classes mostly only a dll not a class.
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CipherISAuthor Commented:
That was it.  Setting it to Compile resolved it.  Thanks.
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