سوال: مشکل با سبد خرید که با کوکی ساخته شده

Layout = "~/Views/Shared/_Layout.cshtml";
}
@model shop.Tbl_Product

@{
string id = ViewBag.id;
string qty = ViewBag.qty;

if(Request.Cookies["mycoock"] == null)
{
HttpCookie mycook = new HttpCookie("mycoock");
mycook.Expires = DateTime.Now.AddYears(1);
Response.Cookies.Add(mycook);

shop.Controllers.Bascket obj = new shop.Controllers.Bascket();
obj.prdID = Int64.Parse(id);

mycook.Value = obj.prdID.ToString();

}
else{
List<shop.Controllers.Bascket> lst_obj = new List<shop.Controllers.Bascket>();
shop.Controllers.Bascket obj = new shop.Controllers.Bascket();

var a =Request.Cookies["mycoock"];
obj = a;//اینجا برای تبدیل ارور میگیره

obj.prdID = 1;
lst_obj.Add(obj);

//a = lst_obj;//اینجا برای تبدیل ارور میگیره
//Response.Cookies["mycoock"] = a;

}