Cannot deploy custom MembershipProvider/RoleProvider assembly to web-site

I have written an assembly (DLL) containing two classes, MyMembershipProvider and MyRoleProvider, which are derived from MembershipProvider and RoleProvider, respectively.  I have implemented most but not all of the abstract methods; the remaining ones all throw a NotImplementedException.  I have signed the assembly and added a reference to it in my web-site project, where the relevant web.config sections look like this:


<membership defaultProvider="MyMembershipProvider"> <providers> <clear/> <add name="MyMembershipProvider" type="MyAuthentication.MyMembershipProvider"/> </providers> </membership> ... <roleManager enabled="true" defaultProvider="MyRoleProvider"> <providers> <clear/> <add name="MyRoleProvider" type="MyAuthentication.MyRoleProvider"/> </provid ...