public HttpResponseMessage UpdateCart(int cartid, int productid, int cartquantity) { var productquantity = entities.tblProducts.Where(p => p.productid == productid) .Select(p => p.productquantity).FirstOrDefault(); if (cartquantity <= productquantity && cartquantity > 0) { entities.proc_Update_Cart(cartid, productid, cartquantity); entities.SaveChanges(); return(Request.CreateResponse(HttpStatusCode.OK, "Success")); } else { return(Request.CreateResponse(HttpStatusCode.OK, "not available")); } }