public IHttpActionResult PutModel(int id, ModelDTO model)
        {
            if (!ModelState.IsValid)
            {
                return BadRequest(ModelState);
            }

            if (id != model.ModelId)
            {
                return BadRequest();
            }

            Model updateModel = new Model();
            updateModel.ModelId = model.ModelId;
            updateModel.Name = model.ModelName;
            updateModel.ManufacturerCode = model.ManufacturerCode;
            updateModel.CategoryId = Int32.Parse(model.CategoryId);
            updateModel.Description = model.Description;
            updateModel.StatusId = Int32.Parse(model.StatusId);
            updateModel.ManufacturerId = Int32.Parse(model.ManufacturerId);
            updateModel.ListPrice = model.ListPrice;

            db.Models.Attach(updateModel);

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

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

            return StatusCode(HttpStatusCode.NoContent);
        }
        public IHttpActionResult PostModel(ModelDTO model)
        {
            Model updateModel = new Model();

            updateModel.Name = model.ModelName;
            updateModel.ManufacturerCode = model.ManufacturerCode;
            updateModel.CategoryId = Int32.Parse(model.CategoryId);
            updateModel.Description = model.Description;
            updateModel.StatusId = Int32.Parse(model.StatusId);
            updateModel.ManufacturerId = Int32.Parse(model.ManufacturerId);
            updateModel.ListPrice = model.ListPrice;

            db.Models.Add(updateModel);
            db.SaveChanges();

            return CreatedAtRoute("DefaultApi", new { id = updateModel.ModelId }, updateModel);
        }