public static string GetFormattedTimeWithoutLetters(TimeSpan timeSpan)
{
return timeSpan.Hours > 0
? string.Format("{0:00}:{1:00}:{2:00}", timeSpan.Hours, timeSpan.Minutes, timeSpan.Seconds)
: string.Format("{0:00}:{1:00}", timeSpan.Minutes, timeSpan.Seconds);
}