Here is the page directive for the page that throws the error:

<%@ Page language="c#" Inherits="University.AspNet.Index" CodeFile="Index.aspx.cs" %>

The code behind file Index.aspx.cs starts like this:

thanks.. it works

Nir

Changing the attribute from "codefile" to "codebehind", should do the trick.

 I found the related article here. http://tek-wise.blogspot.com/2009/07/aspnet-make-sure-that-class-defined-in.html

There is no need to remove the namespace. In your <%page %> tag, change the Inherits attribute to point to the full class name instead of just the class name.

That is, if a code-behind class "_Default" is in the namespace MyNameSpace, then change Inherits = "MyNameSpace._Default" from Inherits = "_Default"

I forgot to inherit System.Web.UI.Page in the basepage class....

I put BasePage.cs in the App_Code folder which contains the implemented class BasePage.  I then inherited the BasePage class in MyClass like this:

 public partial class MyClass : BasePage { //define class}

and then in the BasePage.cs make sure the class BasePage inherits from the System.Web.UI.Page class here.. if not.. make sure you add it like this...

public class BasePage : System.Web.UI.Page{ //define basepage class here}

1. Namespace X

      Namespace Y

        Namespace Z            

            Public Class BasePage

                Inherits System.Web.UI.Page

 2. Public Class MainPageClass 

    Inherits X.Y.Z.BasePage

3. <%@ Page AutoEventWireup="false" CodeFile="myPage.aspx.vb" Inherits="myPage" %>

    Code-behind:

          Partial Public Class myPage

              Inherits MainPageClass 

 ----------------------------------------

It's working fine locally in VWD-2008 but it's throwing an exception when I run the same app in WSS(sharepoint).

Exception: error ASPNET: 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).   at System.Web.Compilation.AssemblyBuilder.Compile() 

Any idea, where I am doing wrong! 

Thanks