.Net 4.0 System.Web.Security.MembershipProvider ambiguous reference?

Question

I have recently upgraded my BlogEngine.Net installation to 1.6 and .Net 4.0, however, I did not build BlogEngine.Core when I performed the upgrade. However, when I try to bu

Answer 1

I just dealt with this same issue when creating a custom membership provider for my web application. You need to remove the reference to System.Web and add the following references. - System.Web.ApplicationServices - System.Configuration

Answer 2

Problem solved. System.Web.Security namespace is a member of System.Web, however, it is also a member of System.Web.ApplicationServices. The project had a reference to System.Web, and a using statement referenced System.Web.Security, so IntelliSense did not throw a flag when specifying the class. However, the project was missing a reference to to System.Web.ApplicationServices. The project had a reference to the class, but it could not load the class because the containing assembly (...ApplicationServices) was missing.