DateDiff in .net seems to round down how can i make it round up!?

DateDiff in .net seems to round down how can i make it round up!?:
e.g difference is 21.51 but date diff returns 21
i want it to round correctly ie give me 22mins.

Any trick to get this behaviour??:afrog:

vb Code:

math.Ceiling(endDate.Subtract(startDate).TotalSeconds / 60)