public static string SectorTimeDelta(TimeSpan? value)
{
if(value == null)
{
return String.Empty;
}
string signSymbol;
TimeSpan time = value.Value;
if(time <= TimeSpan.Zero)
{
signSymbol = "-";
time = TimeSpan.FromTicks(Math.Abs(time.Ticks));
}
else
{
signSymbol = "+";
}
return F("{0}{1}.{2:00}", signSymbol, time.Minutes * 60 + time.Seconds, time.Milliseconds / 10);
}