check on overlapping dates

I have an object which has two date values begin date and end date.  In fact there are multiple objects with begin date and end date. what i want to do is check that the dates of this objects dont overlap with each other. so for example object[0]'s begin date and end date is 08/16/2010 - 08/30/2010 and for object [1] begin date and end date is 08/20/2010-09/30/2010. if this the case then i wan to throw and error message.

can someone tell me how to do this in C#.

pratikshahseAsked:
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nmarunCommented:
Here's a snippet that worked for me.Arun
public class Dummy
{
    public int Id { get; set; }
    public DateTime StartDate { get; set; }
    public DateTime EndDate { get; set; }
}

private static void CheckOverlapDates()
{
    List<Dummy> dummies = new List<Dummy>();
    dummies.Add(new Dummy
                    {
                        Id = 1,
                        StartDate = new DateTime(2010, 1, 1),
                        EndDate = new DateTime(2010, 1, 10)
                    });
    dummies.Add(new Dummy
                    {
                        Id = 2,
                        StartDate = new DateTime(2010, 1, 8),
                        EndDate = new DateTime(2010, 1, 20)
                    });
    dummies.Add(new Dummy
                    {
                        Id = 3,
                        StartDate = new DateTime(2010, 1, 20),
                        EndDate = new DateTime(2010, 1, 30)
                    });
    dummies.Add(new Dummy
                    {
                        Id = 4,
                        StartDate = new DateTime(2010, 1, 30),
                        EndDate = new DateTime(2010, 2, 10)
                    });
    dummies.Add(new Dummy
                    {
                        Id = 5,
                        StartDate = new DateTime(2010, 2, 10),
                        EndDate = new DateTime(2010, 2, 20)
                    });

    for (int i = 0; i < dummies.Count; i++)
    {
        for (int j = i+1; j < dummies.Count; j++)
        {
            if(dummies[i].EndDate > dummies[j].StartDate)
            {
                Console.WriteLine("object {0} overlaps with object {1}", dummies[i].Id, dummies[j].Id);
            }
        }
    }
}

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kris_perCommented:
Logic is:
- if one's start date is within another's start/end dates
- or if one's end date is within another's start/end dates

public bool IsOverlapping()
        {
            List<MyObject> list = new List<MyObject>();

            foreach (MyObject o in list)
            {
                foreach (MyObject i in list)
                {
                    // logic is - if one start date is within another start/end dates
                    // or if one end date is within another start/end dates
                    if( (i.StartDate > o.StartDate && i.StartDate < o.EndDate)
                        || (i.EndDate > o.StartDate && i.EndDate < o.EndDate)
                        || (o.StartDate > i.StartDate && o.StartDate < i.EndDate)
                        || (o.EndDate > i.StartDate && o.EndDate < i.EndDate) )
                    {
                        return true; // yes overlapping
                    }
                }
            }

            return false; // not overlapping
        }

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kris_perCommented:

Contnuing previous code, If the overlapping is including the dates, then you have to add '=' operator in all comparisons above:
public static bool IsOverlapping()
        {
            List<MyObject> list = new List<MyObject>();

            foreach (MyObject o in list)
            {
                foreach (MyObject i in list)
                {
                    // logic is - if one start date is within another start/end dates
                    // or if one end date is within another start/end dates
                    if( (i.StartDate >= o.StartDate && i.StartDate <= o.EndDate)
                        || (i.EndDate >= o.StartDate && i.EndDate <= o.EndDate)
                        || (o.StartDate >= i.StartDate && o.StartDate <= i.EndDate)
                        || (o.EndDate >= i.StartDate && o.EndDate <= i.EndDate))
                    {
                        return true; // yes overlapping
                    }
                }
            }

            return false; // not overlapping
        }

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SadrulCommented:
You should first sort the list in increasing start-date. After that, you can do a linear traversal of the list to figure out if two date-ranges overlap or not. This way, the worst-case running time would be nlog(n), whereas looking in the unsorted list will be n^2.
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anarki_jimbelSenior DeveloperCommented:
About sorting (Sadrul's note) - just to remind that sorting also takes some time and has complexity, e.g., n*log(n)
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SadrulCommented:
Correct. That is why I note that the overall complexity of the process will also be nlog(n) (sorting takes nlog(n), the linear traversal is n).
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