Where is the MembershipProvider abstract class in .NET 4.0 ?

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Question: When I want to create a custom membership provider in asp.net 4, I can not find MembershipProvider abstract class for inheritance , where is it ?

Answer:

It is still under System.Web.Security Namespace but the assembly is System.Web.ApplicationServices but not System.Web

MembershipUser and Other Types in the System.Web.Security Namespace Have Been Moved