关于cookies的详细用法——用户登录和注销

登录(记录Cookies用户名)
HttpCookie myCookie = new HttpCookie("userinfo");
myCookie["uname"] = txtName.Text.Trim();
myCookie.Expires = DateTime.Now.AddDays(1d);
Response.Cookies.Add(myCookie);

显示（用户名）

 if (Request.Cookies["userinfo"] != null)
 {

　　 if (Request.Cookies["userinfo"]["uname"] != null)
　　{ userName.Text = Convert.ToString(Request.Cookies["userinfo"]["uname"]); }
}

删除Cookies

 if (Request.Cookies["userinfo"] != null)
        {
            HttpCookie myCookie = new HttpCookie("userinfo");
            myCookie["uname"] = null;
            myCookie.Expires = DateTime.Now.AddDays(-1d);
            Response.Cookies.Add(myCookie);

　　　}