SteamEmuUtility/Common/Web/InternetConnectionChecker.cs

namespace InternetCommon
{
    public class Internet
    {
        public static bool IsInternetAvailable()
        {
            try
            {
                using (var client = new System.Net.WebClient())
                {
                    using (var stream = client.OpenRead("http://www.google.com"))
                    {
                        return true;
                    }
                }
            }
            catch
            {
                return false;
            }
        }
    }

}