比如建立一个名为aspcn，值为灌水小鱼的cookie

HttpCookie cookie = new HttpCookie["aspcn"];
cookie.Value = "http://www.mamicode.com/灌水小鱼";
Response.AppendCookie(cookie);

取出Cookie值也很简单

HttpCookie cookie = Request.Cookies["aspcn"];
cookieValue = http://www.mamicode.com/cookie.Value;

在一个Cookie中储存多个信息，那也没有问题。比如在名为aspcn的cookie下加多个信息

HttpCookie cookie = new HttpCookie("aspcn");
cookie.Values.Add("webmaster","灌水小鱼");
cookie.Values.Add("writer","beige");
cookie.Values.Add("LinkColor","blue");
Response.AppendCookie(cookie);

取出信息也一样简单

HttpCookie cookie = Request.Cookies["aspcn"];
value1 = cookies.Values["webmaster"];
value2 = cookies.Values["writer"];

HttpCookie cookie = Request.Cookies[strKey];
if(null == cookie)
{
//cookie不存在
}
先看看有没有写入客户端

cookie=new HttpCookie("www.xx.org");
cookie.Values.Add("UserType", ddlLoginType.SelectedItem.Value);
cookie.Values.Add("UserName", tbUserName.Text.Trim());
cookie.Values.Add("Password", tbPassword.Text.Trim());
cookie.Values.Add("Access",i.ToString());
Response.AppendCookie(cookie);
//检查COOKIE是否已经写入浏览器
cookie = Request.Cookies["www.xx.org"];
if(cookie==null||cookie.ToString()=="")
{
//用session存储
LoginUser loginUser = new LoginUser();
loginUser.UserName = tbUserName.Text.Trim();
loginUser.Password = tbPassword.Text.Trim();
loginUser.UserType = ddlLoginType.SelectedItem.Value;
loginUser.Access = i;
Session["www.xx.org"] = loginUser;
}

我以前的代码，没有问题的

>>>页面仅仅是刷新了一次

if you debug, does the code get executed at all? by the way, are you doing any validation?

>>>然后是删除

>>>Response.Cookies.Remove("MyCookie");
>>>Response.Redirect("....") // 转向

>>>然后是删除

HttpCookie cookie = Request.Cookies["myinfo"];
if (cookie != null)
{
cookie.Expires = System.DateTime.Now.AddDays(-1);
}
Response.Cookies.Add(cookie);

cookie值添加获取