How Can I Configure Proxy Connections in C#?

Proxy-Aware C# Connections

Connecting through a proxy in C# can be achieved through either programmatic or declarative methods.

Programmatic Proxy Creation

To programmatically create a proxy, instantiate a WebProxy object and assign it to the Proxy property of a WebRequest object. An example is provided below:

HttpWebRequest request = (HttpWebRequest)WebRequest.Create("[ultimate destination of your request]");
WebProxy myproxy = new WebProxy("[your proxy address]", [your proxy port number]);
myproxy.BypassProxyOnLocal = false;
request.Proxy = myproxy;
request.Method = "GET";
HttpWebResponse response = (HttpWebResponse) request.GetResponse();

Declarative Proxy Configuration

Alternatively, you can configure a default proxy declaratively in your application's web.config or app.config files. Add the following XML block:

<system.net>
  <defaultProxy>
    <proxy
      proxyaddress="http://[your proxy address and port number]"
      bypassonlocal="false"
    />
  </defaultProxy>
</system.net>

This method sets a default proxy that will be used for all subsequent HTTP requests.

Additional Notes

The BypassProxyOnLocal property determines whether to skip the proxy for local connections. The proxyaddress attribute requires a valid proxy address and port number.

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