Question

Given the list of ranges datetime (start and end time), how can I sort them by duration (eg.largest to smallest duration)?

Answer 1

Assuming each object in the list is of the type DateTime then you can use the Ticks property to sort them.

http://msdn.microsoft.com/en-us/library/system.datetime.ticks.aspx

If they are ranges, you can subtract the Ticks of the start time from the Ticks of the end time and use the resulting value to sort.

For example:

DateTime Start = YourStartValue;
DateTime End = YourEndValue;
long Range = End.Ticks - Start.Ticks;

This will give you a number of “Ticks” that represent the length of time in your range, the smaller the number, the shorter the duration.

Repeat this for each range, and then you can sort the results.