Visual Basic.NET - cambiar funcion de C++ a VB

private string GetUniqID()

{

    var ts = (DateTime.UtcNow - new DateTime(1970, 1, 1, 0, 0, 0));

    double t = ts.TotalMilliseconds / 1000;

    int a = (int)Math.Floor(t);

    int b = (int)((t - Math.Floor(t)) * 1000000);

    return a.ToString("x8") + b.ToString("x5");

}