The DefaultWebProxy property gets or sets the global proxy. The DefaultWebProxy property determines the default proxy that all WebRequest instances use if the request supports proxies and no proxy is set explicitly using the Proxy property. Proxies are currently supported by FtpWebRequest and HttpWebRequest.
The DefaultWebProxy property reads proxy settings from the app.config file. If there is no config file, the current user's Internet Explorer (IE) proxy settings are used.
If the DefaultWebProxy property is set to null, all subsequent instances of the WebRequest class created by the Create or CreateDefault methods do not have a proxy.
Windows Phone 8.1, Windows Phone 8, Windows 8.1, Windows Server 2012 R2, Windows 8, Windows Server 2012, Windows 7, Windows Vista SP2, Windows Server 2008 (Server Core Role not supported), Windows Server 2008 R2 (Server Core Role supported with SP1 or later; Itanium not supported)