partial void DeleteCustomer(Customer instance);
 partial void InsertCustomer(Customer instance);
 partial void UpdateCustomer(Customer instance);
        public int SaveCustomer(Customer c)
        {
            try
            {

                dc = new LSQLDataContext();
                dc.Customers.InsertOnSubmit(c);
                dc.SubmitChanges();
            }
            catch (Exception)
            {
                return -1;
            }
            return 0;
        }