What is the best way to check for Internet connectivity using .NET?

What is the fastest and most efficient way to check for Internet connectivity in .NET?

Answer

public static bool CheckForInternetConnection(int timeoutMs = 10000, string url = null)
{
    try
    {
        url ??= CultureInfo.InstalledUICulture switch
        {
            { Name: var n } when n.StartsWith("fa") => // Iran
                "http://www.aparat.com",
            { Name: var n } when n.StartsWith("zh") => // China
                "http://www.baidu.com",
            _ =>
                "http://www.gstatic.com/generate_204",
        };

        var request = (HttpWebRequest)WebRequest.Create(url);
        request.KeepAlive = false
        request.Timeout = timeoutMs;
        using var response = (HttpWebResponse)request.GetResponse();
        return true;
    }
    catch
    {
        return false;
    }
}