// Cookie関連
        [DllImport("wininet.dll", EntryPoint = "InternetSetCookie", ExactSpelling = false, CharSet = CharSet.Unicode, SetLastError = true)]
        static extern bool InternetSetCookie(string domain, string name, string value);
 
        public static void SetCookie(string domain, string name, string value)
        {
            if (!InternetSetCookie(domain, name, value))
                throw new Exception("Exception setting Cookie: Win32 Error");
        }
 
        [DllImport("wininet.dll", EntryPoint = "InternetGetCookie", CharSet = CharSet.Unicode, SetLastError = true)]
        public static extern bool InternetGetCookie(string domain, string name, StringBuilder value, ref int size);
 
        public static string RetriveIECookies(string domain)
        {
            StringBuilder cookie = new StringBuilder(new String(' ', 256), 256);
            int size = cookie.Length;
 
            if (!InternetGetCookie(domain, null, cookie, ref size))
            {
                if (size < 0) return String.Empty;
 
                new StringBuilder(size);
                InternetGetCookie(domain, null, cookie, ref size);
            }
 
            return cookie.ToString();
        }

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