I am in the process of converting a Web Site to a Web Application project.  The .aspx pages are all children of a master page, and they use the directive:

<%@ MasterType VirtualPath="~/e332Master.master" %>

From researching, I see everywhere that this is supposed to work.  But, in this case, the directive is causing a compile error:

Error 1 Type 'WOPS_Solution.e332Master' is not defined. C:\Inetpub\wwwroot\WOPS_Solution\WOPS_Solution\AllOrders.aspx.designer.vb 402 50 WOPS_Solution

in the child page designer files, on the WOPS_Solution.e332Master type:

Public Shadows ReadOnly Property Master() As WOPS_Solution.e332Master
    Get
        Return CType(MyBase.Master, WOPS_Solution.e332Master)
    End Get
End Property

It will compile if I remove WOPS_Solution. , but I can't do that since it will re-generate next time the page is changed.  I created a new, quick and dirty, NOT CONVERTED, Web Application Project, with a master page and the directive, and a child page.  Of course, that works fine, so the problem must have something to do with the conversion. 

Thanks in advance for any help in fixing this! 

Hi,

In fact, the @MasterType directive provides a way to create a strongly typed reference to the ASP.NET master page when the master page is accessed from the Master property.

So if you add the @ MasterType directive in the content page, you can write code in content pages that references properties, methods, and controls in the master page, with some restrictions. It is not necessary to declare master page in the content page.

The more you can try to refert this MSDN article: http://msdn.microsoft.com/en-us/library/xxwa0ff0.aspx

 I'm having this exact problem.  My converted app has the problem, but a newly created test app does not.  Does anyone have a solution to this?

I have the same problem. Very annoying. I think it is my web.config file. I remove it use a base copy it works. I edit the mastertype put it on top it works sometimes. I wish there was a solution also. Thought my code was broken for the entire afternoon when it was working.