需要注意HttpOnly,Path等属性。完整的测试代码：
ASPX 代码
<%@ Page Language="C#" %><!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
""><script runat="server">protected void Page_Load(object sender, EventArgs e)
{ if (!Page.IsPostBack) { HttpCookie Cookie = new HttpCookie("user"); Cookie.Values.Add("name", "mxh"); Cookie.Values.Add("id", "net_lover"); Cookie.Expires = DateTime.Now.AddDays(1); Cookie.HttpOnly = false; Cookie.Path = "/"; Response.Cookies.Add(Cookie); } }protected void Button1_Click(object sender, EventArgs e)
{ if (Request.Cookies["user"] == null) { Response.Write("已经删除"); } else { Response.Write("Cookie值： " + Request.Cookies["user"]["name"]); }}
</script><html xmlns=""><head> <title>dotnet.aspx.cc Cookie 测试</title> <script type="text/javascript"> function deleteCookie() { var expires = new Date(); expires.setUTCFullYear(expires.getUTCFullYear() - 1); document.cookie = "user=name=&id=; expires=" + expires.toUTCString() + "; path=/"; } </script></head><body> <form id="form1" runat="server"> <input type="button" value="删除" οnclick="deleteCookie()" /> <asp:Button ID="Button1" runat="server" OnClick="Button1_Click" Text="查看Cookie" /> </form></body></html>作者：孟宪会