How to inherit App_Code class in System.Web.UI.Page

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C#

Hi,

I have one ASPX page and its code is lik

using System;
using System.Configuration;
using System.Data;
using System.Linq;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.HtmlControls;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Xml.Linq;


public partial class _Default :System.Web.UI.Page 
{
    
    protected void Page_Load(object sender, EventArgs e)
    {

    }
}

I have another class file in App_Code folder and its code is

using System;
using System.Data.SqlClient;

/// <summary>
/// Summary description for GlobalVariable
/// </summary>
/// 

    public class GlobalVariable
    {
        public GlobalVariable()
        {
            //
            // TODO: Add constructor logic here
            //
        }

        public void test()
        {

        }       


    }


Now i want to inherit GlobalVariable class in _Default class . my code is like

using System;
using System.Configuration;
using System.Data;
using System.Linq;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.HtmlControls;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Xml.Linq;


public partial class _Default :GlobalVariable 
{
    
    protected void Page_Load(object sender, EventArgs e)
    {

    }
    public void LoadObject()
    {
        
    }

    protected void Button1_Click(object sender, EventArgs e)
    {
        
    }
}

But it is not working. I am finding some errors like.
Make sure that the class defined in this code file matches the 'inherits' attribute, and that it extends the correct base class (e.g. Page or UserControl).

Can any one help me

Thanks in advance

Rashed