public ActionResult DeleteCategory(int id)
        {
            CategoryDataStore Obj = new CategoryDataStore();
            // check if this category is in product
            ProductDataStore ObjProd = new ProductDataStore();

            if (ObjProd.CheckCategory(id))
            {
                TempData["ErrorMessage"] = "You can not delete this category, please delete related product first.";
                return(RedirectToAction("Category"));
            }
            else
            {
                if (Obj.DeleteCategory(id) == true)
                {
                    //return View("Category");
                    return(RedirectToAction("Category"));
                }
                else
                {
                    return(View("ErrorEventArgs"));
                }
            }
        }