请问下怎么清除cookie？

[yurima]

交谈中请勿轻信汇款、中奖信息、陌生电话，勿使用外挂软件。

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;

namespace cookie1
{
public partial class WebForm1 : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{

}

protected void Button1_Click(object sender, EventArgs e)
{
HttpCookie cook = new HttpCookie("usename");
cook.Value = TextBox1.Text;
cook.Expires = DateTime.Now.AddDays(30);
Response.Cookies.Add(cook);
}

protected void Button2_Click(object sender, EventArgs e)
{

HttpCookie cooks = Request.Cookies["usename"];
if ( cooks== null)
{
TextBox2.Text = "无值！";
}
else
{
TextBox2.Text =cooks.Value;
}
}

protected void Button3_Click(object sender, EventArgs e)
{
Request.Cookies["usename"].Expires = DateTime.Now.AddDays(-1);
// Request.Cookies.Remove("usename");//清除指定Cookie
//Request.Cookies.Clear();//清除所有Cookie
}

}
}


button3里的三个方法都试过了，不行。谢谢大侠，小弟非常菜鸟。

[孟子E章]

HttpCookie cook = Request.Cookies["usename"];

cook.Expires = DateTime.Now.AddDays(-30);
Response.Cookies.Add(cook);

[yurima]

我知道了 是response 不是request 真是粗心！！

[yyl8781697]

把要去掉的cookie的过期时间设为现在以前就可以去掉了

[ONE-PIECE]

顶！！！

[Quote=引用 1 楼 的回复:]
HttpCookie cook = Request.Cookies["usename"];

cook.Expires = DateTime.Now.AddDays(-30);
Response.Cookies.Add(cook);
[/Quote]

[大渣吼吾系渣渣辉]

[Quote=引用 1 楼 的回复:]

HttpCookie cook = Request.Cookies["usename"];

cook.Expires = DateTime.Now.AddDays(-30);
Response.Cookies.Add(cook);
[/Quote]
是的，让其过期

[天殇月痕]

设置过期时间