Cookie 删除不了啊，Help？
添加cookieHttpCookie cookie = new HttpCookie("user_name", Server.UrlEncode(txt_username.Text.Trim()));
cookie.Expires = DateTime.Now.AddDays(5);
cookie.Domain = "wl.com.cn";
cookie.Secure = false;
Response.AppendCookie(cookie);
HttpCookie cookieid = new HttpCookie("psid", Server.UrlEncode(ds.Tables[0].Rows[0]["UserID"].ToString().Trim()));
cookieid.Expires = DateTime.Now.AddDays(5);
cookieid.Domain = "wl.com.cn";
cookieid.Secure = false;
Response.AppendCookie(cookieid);
删除
HttpCookie cookie = Request.Cookies["user_name"];
cookie.Expires = DateTime.Now.AddDays(-10);
cookie.Domain = "wl.com.cn";
cookie.Secure = true;
Response.AppendCookie(cookie);
cookie = Request.Cookies["psid"];
cookie.Expires = DateTime.Now.AddDays(-10);
cookie.Domain = "wl.com.cn";
cookie.Secure = true;
Response.AppendCookie(cookie);
怎么删除不了啊？？求解？？ Cookie --------------------编程问答--------------------
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--------------------编程问答--------------------
代码没有问题补充：.NET技术 , C#
