I wanna creat a custom membership provider in asp.net 4 but the problem is I cann't find MembershipProvider abstract class for inheritance !?!?
It seems really straing but I don't know what is wrong with this ?
I've create a class library and refrenced to configuration and web assembelies but I couldn't inherit from System.Web.Security.MembershipProvider ?
any idea is welcome in forward .
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