I am getting an exception thrown by the ASP.NET Development Web Server "Type is not resolved for member 'Model.AppIdentity,Model, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null'" It works fine in IIS6. Any ideas?
That might be an issue with Cassini and serialization exception when implementing IIdentity interface. Here is a post about it Cassini&SerializationException
If that is your case, a workaround could be to make your class implementing IIdentity to inherit from MarshalByRefObject.