Question

hi i have more than 10 arraylist in my project, i need to compare all arraylist for their count(same or not). here i need shortest way to find that.
am not sorting i need to find length of all arraylist count(same or not).

Answer 1

Put them in an array and compare their counts:

private static bool CountsAreEqual(ICollection[] lists)
{
    int previousCount = lists[0].Count;
    for (int i = 1; i < lists.Count; i++)
    {
        if (lists[i].Count != previousCount)
        {
            return false;
        }
    }
    return true;
}

Used like so:

ArrayList arr1 = GetFirstList();
ArrayList arr2 = GetSecondList();
CountsAreEqual(new[] {arr1, arr2});