Already I have known 3 types of memberships in Microsoft MVC. They are:
Obviously they have differences to use. What is the key advantage for selecting each of them? May somebody describe?
Thanks.
The following post from Jon Galloway goes into great detail explaining what I think it is you are asking.
The article includes a class diagram that shows the relationship between all three classes that you have listed.
The relevant take-away quote is this one:
SimpleMembershipProvider is an implementaiton of an ExtendedMembershipProvider, which inherits from MembershipProvider and adds some other account / OAuth related things.
Be sure to look at the class diagram, it is in the section called How SimpleMembership integrates with ASP.NET Membership
Hope that helps.