C# Winform 如何写Cookie 加急

读取cookies类如下
 public class GetCookie
    { /**/
        /// <summary>
        /// 通过COM来获取Cookie数据。
        /// </summary>
        /// <param name="url">当前网址。</param>
        /// <param name="cookieName">CookieName.</param>
        /// <param name="cookieData">用于保存Cookie Data的<see cref="StringBuilder"/>实例。</param>
        /// <param name="size">Cookie大小。</param>
        /// <returns>如果成功则返回<c>true</c>,否则返回<c>false</c>。</returns>
        [DllImport("wininet.dll", SetLastError = true)]
        public static extern bool InternetGetCookie(
          string url, string cookieName,
          StringBuilder cookieData, ref int size);
       
        /**/
        /// <summary>
        /// 获取当前<see cref="Uri"/>的<see cref="CookieContainer"/>实例。
        /// </summary>
        /// <param name="uri">当前<see cref="Uri"/>地址。</param>
        /// <returns>当前<see cref="Uri"/>的<see cref="CookieContainer"/>实例。</returns>
        public static CookieContainer GetUriCookieContainer(Uri uri)
        {
            CookieContainer cookies = null;            // 定义Cookie数据的大小。
            int datasize = 256;
            StringBuilder cookieData = new StringBuilder(datasize);            if (!InternetGetCookie(uri.ToString(), null, cookieData,
              ref datasize))
            {
                if (datasize < 0)
                    return null;                // 确信有足够大的空间来容纳Cookie数据。
                cookieData = new StringBuilder(datasize);
                if (!InternetGetCookie(uri.ToString(), null, cookieData,
                  ref datasize))
                    return null;
            }
            if (cookieData.Length > 0)
            {
                cookies = new CookieContainer();
                cookies.SetCookies(uri, cookieData.ToString().Replace(';', ','));
            }
            return cookies;
        }获取cookie 
private void MainForm_Load(object sender, EventArgs e)
 {
 CookieContainer cc = Common.GetCookie.GetUriCookieContainer(new Uri(Common.AppSetting.GetAppStrings("weburl", "")));
            if (cc != null)
            {
                CookieCollection cl = cc.GetCookies(new Uri(Common.AppSetting.GetAppStrings("weburl", "") + "/Manage/default.aspx"));
                foreach (Cookie cook in cl)
                {
                    if (cook.Name == "UserCookies")
                    {
                        CookieName = cook.Name;
                        CookieValue = cook.Value;
                        string path1 = cook.Path;
                        string domain = cook.Domain;
                        string expries = cook.Expires.ToString();
                     
                    }
                }
            }
}现在读取游览器登陆的cookie是成功的 我现在想实现 在C#读取cookie后保存，然后用保存的这个cookie在次写入游览器的cookie里这样就不用登陆 就可以直接访问页面了。 求解 如何再次写入cookie