Check if a date range is within a date range

Question

I have the following class:

public class Membership
{
    public DateTime StartDate { get; set; }
    public DateTime? EndDate { get; set; } // If null then          


        

Answer 1

So if I understand this correctly - you want to make sure date range 2 is not within date range 1?

For example:

startDate1 = 01/01/2011

endDate1 = 01/02/2011

and

startDate2 = 19/01/2011

endDate2 = 10/02/2011

This should be a simple case of:

if ((startDate2 >= startDate1 &&  startDate2 <= endDate1) || 
    (endDate2   >= startDate1 && endDate2   <= endDate1))