TimeSpan.TimeSpan C# (CSharp) Метод

    public TimeSpan(DateTime start, DateTime end)
    {
        System.TimeSpan diff = end.Subtract(start);
        this.hours = diff.Hours;
        this.minutes = diff.Minutes;
        this.seconds = diff.Seconds;

        System.TimeSpan  tmp = new System.TimeSpan(diff.Hours, diff.Minutes, diff.Seconds);
        result = tmp.ToString();
    }