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public bool Login(string userName, string passwd, out string errorMessage)        {            errorMessage = "";            bool b = Membership.ValidateUser(userName, passwd);            if (b == true)            {                return true;            }

// The first one must have connection string in the App.conig// first, inherits from Membership class (SqlMembershipProvider, or MemershipProvider ( this is an abstract class)) using System;