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The multiplexing membership provider uses the CreateUser method on the DefaultProvider. Disassembling EPiServer.Security shows
MembershipUser membershipUser = this.DefaultProvider.CreateUser(..
Assuming you're using the default configuration, I guess that would be provider1; System.Web.Security.SqlMembershipProvider. CMIIMW. If I remember correctly the SqlMembershipProvider calls an aspnet stored procedure on the database (dbo.aspnet_Membership_CreateUser or the like). So a guess would be that Membership.CreateUser() ends up doing the same thing.
If you'd like to have a look try ILspying System.Web.Security.SqlMembershipProvider.CreateUser
Hope this helps.
//Mathias
Is it the same to use the .NET procedures than the EPiServer ones while creating users, roles and profiles?
I mean, is it the same to do use this:
Membership.CreateUser()
and this:
multiplexingMembershipProvider.CreateUser()
Thanks