public ActionResult PostDrugDetails(AdminDrugDetailsModel model)
        {
            using (ProjectEntities db = new ProjectEntities())
            {
                if (model.DrugId == 0)
                {
                    // insert
                    db.InsertDrugDetails(model.DrugName, model.ManufactureDate, model.ExpiredDate, model.UsedFor,
                                         model.SideEffects, model.TotalQuantityAvailable, model.IsDeleted);

                    ViewBag.Message = "Inserted";
                }
                else
                {
                    // update
                    db.UpdateDrugDetails(model.DrugId, model.DrugName, model.ManufactureDate, model.ExpiredDate,
                                         model.UsedFor, model.SideEffects, model.TotalQuantityAvailable, model.IsDeleted);

                    ViewBag.Message = "Updated";
                }
            }
            return(View("AddDrugDetails"));
        }