Signature of the body and declaration in a method implementation do not match. - on master page

I开发者_Go百科 just converted my .net 2.0 application to a .net 3.5 application

• there was an error converting the website project
• so i recreated the website project
• added the website files again (which converted successfully) and got added to the project

No build errors

but on runtime I get this error:

Server Error in '/' Application.

Parser Error

Description: An error occurred during the parsing of a resource required to service this request. Please review the following specific parse error details and modify your source file appropriately.

Parser Error Message: Signature of the body and declaration in a method implementation do not match. Type: 'MyMaster'. Assembly: 'CompName.ProjectName, Version=1.2.3631.30873, Culture=neutral, PublicKeyToken=null'.

Source Error:

Line 1:  <%@ Import namespace="System.Diagnostics"%>

Line 2: <%@ Master Language="C#" AutoEventWireup="true" Inherits="MyMaster" Codebehind="MyMaster.master.cs" %>

Line 3:  <%@ Register Src="Controls/MyControl.ascx" TagName="MyControl"     TagPrefix="mc"%>
Line 4:

The underlying error was an Ajax Problem

The new website project was pointing to the new Ajax DLL in the .net entity framework (System.Extensions)

I had to goto the .proj file in notepad and edit the reference to point to the old .net AJAX DLL.