cookies 怎么存取主键

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

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HttpCookie x = new HttpCookie("key","value");
Response.Cookies.Add(x);

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

HttpCookie x = new HttpCookie("id",UserId);
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探讨

HttpCookie x = new HttpCookie("key","value");
Response.Cookies.Add(x);

取
Request.Cookies["key"].Value