Useful as a quick check to see if a client has an active internet connection.

IsConnectedWeb.cs

//Adapted from http://answers.unity3d.com/questions/534873/testing-for-active-internet-connection.html
	public static bool IsConnectedWeb(string checkurl = "http://www.google.com")
	{
		System.Net.WebClient client = null;
		System.IO.Stream stream = null;
		try
		{
			client = new System.Net.WebClient();
			stream = client.OpenRead(checkurl);

			if (client != null) { client.Dispose(); }
			if (stream != null) { stream.Dispose(); }

			return true;
		}
		catch (Exception ex)
		{
			if (client != null) { client.Dispose(); }
			if (stream != null) { stream.Dispose(); }

			return false;
		}
	}