How to fix namespace problem with autogenerated Master property if MasterType is set

Question

after weeks of having this issue I finally decided to ask for a solution to the following problem:

In the .aspx page you can set

<%@ MasterType          


        

Answer 1

Change

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

to

<%@ MasterType TypeName="Mastername" %>

this will work perfectly