Enable/Disable Proxy in IE through C#

// ProxyEnable == 0 means the proxy is on
// ProxyEnable == 1 means the proxy is off

string key = "Software\\Microsoft\\Windows\\CurrentVersion\\Internet Settings";

                string serverName = ConfigurationManager.AppSettings["proxyAddress"];

                int port = Convert.ToInt32(ConfigurationManager.AppSettings["proxyPort"]);

                string proxyy = serverName + ":" + port;

                RegistryKey RegKey = Registry.CurrentUser.OpenSubKey(key, true);

                RegKey.SetValue("ProxyServer", proxyy);

                RegKey.SetValue("ProxyEnable", 1);

                proxy = new WebProxy(proxyy, true);;

                proxy.Credentials = CredentialCache.DefaultCredentials;

                proxy.BypassProxyOnLocal = true;