Change IE proxy via C#

InternetExplorerProxyHelper.cs

        [DllImport("wininet.dll")]
        public static extern bool InternetSetOption(IntPtr hInternet, int dwOption, IntPtr lpBuffer, int dwBufferLength);
        public const int INTERNET_OPTION_SETTINGS_CHANGED = 39;
        public const int INTERNET_OPTION_REFRESH = 37;


        static void setProxy(string proxyhost, bool proxyEnabled)
        {
            const string userRoot = "HKEY_CURRENT_USER";
            const string subkey = "Software\\Microsoft\\Windows\\CurrentVersion\\Internet Settings";
            const string keyName = userRoot + "\\" + subkey;

            Registry.SetValue(keyName, "ProxyServer", proxyhost);
            Registry.SetValue(keyName, "ProxyEnable", proxyEnabled?"1": "0");

            // These lines implement the Interface in the beginning of program 
            // They cause the OS to refresh the settings, causing IP to realy update
            InternetSetOption(IntPtr.Zero, INTERNET_OPTION_SETTINGS_CHANGED, IntPtr.Zero, 0);
            InternetSetOption(IntPtr.Zero, INTERNET_OPTION_REFRESH, IntPtr.Zero, 0);
        }