static public string ToDaysHoursMinutesSecondsMillisecondsString(this Duration item) { int days; int hours; int minutes; int seconds; int milliseconds; item.GetDaysHoursMinutesSecondsMilliseconds(out days, out hours, out minutes, out seconds, out milliseconds); return(days + ":" + hours.ToString("D2") + ":" + minutes.ToString("D2") + ":" + seconds.ToString("D2") + "." + milliseconds.ToString("D3")); }