mvc存儲Cookie和讀取Cookie方法：
//存儲
HttpCookie cookie = new HttpCookie("User");
System.Text.Encoding enc = System.Text.Encoding.GetEncoding("gb2312");
cookie["id"] = HttpUtility.UrlEncode(logid.ToString(), enc);
cookie["UserName"] = HttpUtility.UrlEncode(loginname, enc);
cookie["password"] = HttpUtility.UrlEncode(loginpass, enc);
//讀取
System.Text.Encoding encr = System.Text.Encoding.GetEncoding("gb2312");
string id = HttpUtility.UrlDecode(cookie["id"], encr);
string UserName = HttpUtility.UrlDecode(cookie["UserName"], encr);
string password = HttpUtility.UrlDecode(cookie["password"], encr);