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

A bit late but I couldn't find this pattern anywhere in the answers/comments.

    if (startDate1 <= endDate2 && startDate2 <= endDate1)
    {
     // Overlaps.
    }