public string Save(Borrow borrow)
        {
            if (borrow.MemberId.ToString()== string.Empty)
            {
                return "Memeber Id is missing";
            }

            else if (borrowGateway.HasThisMemberTakenBook(borrow.MemberId,borrow.BookId))
            {
                return "This Memeber has already taken book.";
            }

            else
            {
                int value = borrowGateway.Save(borrow);

                if (value > 0)
                {
                    return "Borrow Information Saved Successfully";
                }

                else
                {
                    return "Operation Failed";
                }
            }
        }
        public int Save(Borrow borrow)
        {
            SqlConnection connection = new SqlConnection(connectionstring);
            string query = "INSERT INTO Borrow_Return VALUES('"+borrow.MemberId+"','"+borrow.BookId+"')";

            SqlCommand command = new SqlCommand(query, connection);

            connection.Open();

            int rowsAffected = command.ExecuteNonQuery();

            connection.Close();
            return rowsAffected;
        }