IComparable

[Techno]

I've implemented this before a very long time ago and since I forgot, i read up about it again to see what the method should look like for CompareTo()

I have implemented this correctly but when I sort the ArrayList giving it null as a parameter, it seems not to sort it but do it in decending order.

So:
I have an arraylist of specific objects (note, this is not a general list....this is using .NET 1.1)

I have implemented the IComparable interface and its method for the object type in question.

I did an: collection.Sort(null); and it didnt seem to sort it (but it does call the compareTo() method):

#region IComparable Members

		public int CompareTo(object obj)
		{
			// TODO:  Add VacancyInfoHelper.CompareTo implementation
			if ((obj is VacancyInfoHelper) == false)
			{
				return -1;
			}

			VacancyInfoHelper helper = (VacancyInfoHelper)obj;
			return this.rank.CompareTo(helper.rank);
		}

#endregion

edit: forgot to mention it is an ASP.NET application and since the private field "rank" is set to 0 by default, would that make much difference? I believe it is so how do I do sorting on an ASP.NET based application?