// PUT odata/Suppliers(5)
        public IHttpActionResult Put([FromODataUri] int key, Supplier supplier)
        {
            if (!ModelState.IsValid)
            {
                return BadRequest(ModelState);
            }

            if (key != supplier.Id)
            {
                return BadRequest();
            }

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

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

            return Updated(supplier);
        }
        // POST odata/Suppliers
        public IHttpActionResult Post(Supplier supplier)
        {
            if (!ModelState.IsValid)
            {
                return BadRequest(ModelState);
            }

            db.Suppliers.Add(supplier);
            db.SaveChanges();

            return Created(supplier);
        }