BetterMembership.Web.BetterMembershipProvider.GetUserNameByEmail C# (CSharp) Метод

        public override string GetUserNameByEmail(string email)
        {
            Condition.Requires(email, "email").IsNotNullOrWhiteSpace();

            if (!this.HasEmailColumnDefined)
            {
                throw new ProviderException("userEmailColumn is not defined");
            }

            using (var db = this.ConnectToDatabase())
            {
                return db.QueryValue(this.sqlQueryBuilder.GetUserNameByEmail, email) as string;
            }
        }