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实在是想不到问题的所在了
//这个是来写/更新cookie的某一个键的
public static void WriteCookies(string key, string value)
    {
        if (value != null)
            value = HttpUtility.UrlEncode(value, Encoding.Default);
        HttpCookie cookie1 = HttpContext.Current.Request.Cookies[_cookie_name];
        if (cookie1 == null)
        {
            cookie1 = new HttpCookie(_cookie_name);
            cookie1.Values.Add(key, value);
            cookie1.Expires = DateTime.Now.AddYears(1);
            cookie1.Domain = Function.getModule().CookieDomain;
            HttpContext.Current.Response.Cookies.Add(cookie1);
            return;
        }
        cookie1.Values[key] = value;
        cookie1.Expires = DateTime.Now.AddYears(1);
        cookie1.Domain = Function.getModule().CookieDomain;
        HttpContext.Current.Response.Cookies.Set(cookie1);
    }
//这是得到当前cookie一个键的值
    public static string GetCookisValue(string key)
    {
        HttpCookie myCookie = HttpContext.Current.Request.Cookies[_cookie_name];
        if (myCookie != null)
        {
            if (myCookie.Values[key] != null)
                return HttpUtility.UrlDecode(myCookie.Values[key].ToString(),Encoding.Default);
            return "";
        }
        return "";
       
    }

调用该方法：
 global.WriteCookies("Name", _txt_username.Text.Trim());
 global.WriteCookies("Url", _homepage);

每次只更新了Url,却没有更新Name
跟踪时出现的怪现象是：
跟踪到第一个WriteCookies("Name","");时，更新正常，此时Name已被更新
跟踪到下一个WriteCookies("Url"......);时，却发现更新过的name键又还原了

这是当前页面的cookie
AJSTAT_ok_pages
AJSTAT_ok_times
CommentUser
Name=12345
Url=http%3a%2f%2fwww.123456c78.com
ASP.NET_SessionId

Name一直改不了，URl倒是可以更新

怪在调用同一方法，为什么只能更新第二个键？
请大家帮解一下