public ActionResult Details(int id)
 {
     if (Session["LoginID"] != null)
     {
         List <OrderProduct> orderProductList = new List <OrderProduct>();
         ProductHistory      producthis       = productHistory.GetByProductNameCategory(product.Get(id).Product_name, product.Get(id).CategoryID);
         int pid = producthis.Product_id;
         orderProductList = OrderProduct.GetByCustomerId((int)Session["LoginID"], pid);
         if (orderProductList.Count == 0)
         {
             Session["notbuy"] = "In order to review you need to Buy this product";
         }
         else
         {
             Session["notbuy"] = null;
         }
     }
     return(View(product.Get(id)));
 }