cookies 怎么存取主键

cookies 如何存取主键
cookies 如何存取主键？
Csharp代码

[解决办法]
HttpCookie x = new HttpCookie("key","value");
Response.Cookies.Add(x);

取
Request.Cookies["key"].Value
[解决办法]
从数据库读取到UserId

HttpCookie x = new HttpCookie("id",UserId);
[解决办法]