cookies如何保存用户名和密码

cookies怎么保存用户名和密码
cookies怎么保存用户名和密码
然后怎么提取用户名
然后下次登录的时候 如果cookies还在就直接进去了 
怎么做啊

C# code

        UserInfo user = new UserInfo();        user.username = this.username.Text.ToString();        user.password = System.Web.Security.FormsAuthentication.HashPasswordForStoringInConfigFile(password.Text, "MD5"); //TextBox1.Text为密码框的值        if (user.CheckLogin())        {           //这里怎么用cookies保存用户名和密码 啊。然后 以后提取用户名和密码 怎么用啊         }        else        {            Response.Write("<script>alert('登录失败！')</script>");        } 

[解决办法]
一、写Cookies的方法：
Response.cookies["mycookie"]["username"]="admin"
Response.cookies["mycookie"]["password"]="123"
其中“mycookie”就是Cookies名，而后面括号中的就是key

二、读取Cookies的方法：
username=Request.Cookies["mycookie"]["username"]
password= Request.Cookies["mycookie"]["password"]

这只是个临时用法，不能设置保存时间，设置保存时间的要麻烦一点

[解决办法]
System.Web.HttpCookie newcookie = new HttpCookie("user");
newcookie.Values["username"] = "";
newcookie.Values["password"] = "";
newcookie.Expires = DateTime.Now.AddDays(15);
Response.AppendCookie(newcookie);


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

HttpCookie cookie = System.Web.HttpContext.Current.Request.Cookies[cookiename]; 
if (cookie != null) 
{ 
cookie.Values.Clear(); 
SetUserCookieExpireTime(cookiename, -1); 
cookie.Domain = _domain; 
System.Web.HttpContext.Current.Response.Cookies.Set(cookie); 
} 
public static void SetUserCookieExpireTime(string key, int days) 
{ 
System.Web.HttpContext.Current.Response.Cookies[key].Domain = _domain; 
System.Web.HttpContext.Current.Response.Cookies[key].Path = _cookiepath; 
System.Web.HttpContext.Current.Response.Cookies[key].Expires = DateTime.Now.AddDays(days); 
} 

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