public static bool Login(string username, string password)
        {
            EFIdentity identity = new EFIdentity().GetIdentity(username, password);
            if (identity.IsAuthenticated)
            {
                EFPrincipal principal = new EFPrincipal(identity);
                HttpContext.Current.User = principal;
                return true;    
            }

            return false;
        }
 public EFPrincipal(EFIdentity identity)
 {
     _identity = identity;
 }