public IHttpActionResult PutCustomer(int id, Customer customer)
        {
            if (!ModelState.IsValid)
            {
                return BadRequest(ModelState);
            }

            if (id != customer.Id)
            {
                return BadRequest();
            }

            db.Entry(customer).State = EntityState.Modified;

            try
            {
                db.SaveChanges();
            }
            catch (DbUpdateConcurrencyException)
            {
                if (!CustomerExists(id))
                {
                    return NotFound();
                }
                else
                {
                    throw;
                }
            }

            return StatusCode(HttpStatusCode.NoContent);
        }
        public IHttpActionResult PostCustomer(Customer customer)
        {
            customer.RegistrationId = "1";
            customer.GSTRegistrationId = "1";
            //customer.PaymentTermId = 0;
            customer.ContextCompanyId = 0;
            customer.ContextLocationId = 0;
            customer.ParentCustomerId = 0;
            customer.CompanyId = 1;
            customer.LocationId = 1;
            customer.Createdby = 1;
            if (!ModelState.IsValid)
            {
                return BadRequest(ModelState);
            }

            db.Customers.Add(customer);
            db.SaveChanges();

            return CreatedAtRoute("DefaultApi", new { id = customer.Id }, customer);
        }