// POST api/RequisitionDeliveryDescription
        public HttpResponseMessage PostRequisitionDeliveryDescription(RequisitionDeliveryDescription requisitiondeliverydescription)
        {
            // long RequisitionID=(long)db.RequisitionDeliveries.Where(r=>r.RequisitionDeliveryID==requisitiondeliverydescription.RequisitionDeliveryID).Select(s=>s.PurchaseRequisitionID).SingleOrDefault();
            PurchaseRequisitionDescription purchaseRequisitionDescription = db.PurchaseRequisitionDescriptions.Where(r => (r.PurchaseRequisitionID == requisitiondeliverydescription.PurchaseRequisitionID) && (r.ProductID == requisitiondeliverydescription.ProductID)).SingleOrDefault();
            if (ModelState.IsValid)
            {
                db.Entry(requisitiondeliverydescription).State = requisitiondeliverydescription.RequisitionDeliveryDescriptionID == 0 ? EntityState.Added : EntityState.Modified;
                //db.RequisitionDeliveryDescriptions.Add(requisitiondeliverydescription);
                requisitiondeliverydescription.InsertBy = loginUser.UserID;
                db.SaveChanges();

                var DeliveredQty = (db.RequisitionDeliveryDescriptions.Where(r => (r.ProductID == requisitiondeliverydescription.ProductID) && (r.PurchaseRequisitionID == requisitiondeliverydescription.PurchaseRequisitionID)).Select(r => r.Quantity)).ToList().Sum();
                var ReceivedQuantity = (db.RequisitionDeliveryDescriptions.Where(r => (r.ProductID == requisitiondeliverydescription.ProductID) && (r.PurchaseRequisitionID == requisitiondeliverydescription.PurchaseRequisitionID)).Select(r => r.ReceivedQuantity)).ToList().Sum();
                purchaseRequisitionDescription.DeliveredQuantity = (float)DeliveredQty;
                purchaseRequisitionDescription.ReceivedQuantity = (float)ReceivedQuantity;

                db.Entry(purchaseRequisitionDescription).State = EntityState.Modified;
                db.SaveChanges();

                if (requisitiondeliverydescription.ReceivedQuantity > 0)
                {
                    Product product = db.Products.Where(p => p.ProductID == requisitiondeliverydescription.ProductID).SingleOrDefault();
                    product.CurrentStock -= requisitiondeliverydescription.ReceivedQuantity;
                    db.Entry(product).State = EntityState.Modified;
                    db.SaveChanges();

                }

                HttpResponseMessage response = Request.CreateResponse(HttpStatusCode.Created, requisitiondeliverydescription);
                response.Headers.Location = new Uri(Url.Link("DefaultApi", new { id = requisitiondeliverydescription.RequisitionDeliveryDescriptionID }));
                return response;
            }
            else
            {
                return Request.CreateErrorResponse(HttpStatusCode.BadRequest, ModelState);
            }
        }
        // PUT api/RequisitionDeliveryDescription/5
        public HttpResponseMessage PutRequisitionDeliveryDescription(long id, RequisitionDeliveryDescription requisitiondeliverydescription)
        {
            if (!ModelState.IsValid)
            {
                return Request.CreateErrorResponse(HttpStatusCode.BadRequest, ModelState);
            }

            if (id != requisitiondeliverydescription.RequisitionDeliveryDescriptionID)
            {
                return Request.CreateResponse(HttpStatusCode.BadRequest);
            }

            requisitiondeliverydescription.UpdateBy = loginUser.UserID;
            db.Entry(requisitiondeliverydescription).State = EntityState.Modified;

            try
            {
                db.SaveChanges();
            }
            catch (DbUpdateConcurrencyException ex)
            {
                return Request.CreateErrorResponse(HttpStatusCode.NotFound, ex);
            }

            return Request.CreateResponse(HttpStatusCode.OK);
        }