>>Using a Dictionary < Tkey, TValue > would be better
>
>Thanks, I remember having read some of that in previous threads. I might have to consider that.


You can update the value of a dictionary

Here, I use a Tuple of three integers - for simplicity the first one is the key

		public static void Main()
		{


			Dictionary<int, Tuple<int, int, int>> dict = new Dictionary<int, Tuple<int, int, int>>();

			Tuple<int, int, int> t;  // key is tuple.Item1

			t = new Tuple<int, int, int>(1, 1, 1);
			UpdateDictionary(dict, t);

			t = new Tuple<int, int, int>(2, 1, 1);
			UpdateDictionary(dict, t);

			PrintDictionary("Before any update", dict);

			t = new Tuple<int, int, int>(2, 2, 2);
			UpdateDictionary(dict, t);

			PrintDictionary("After update", dict);
			Console.ReadLine();
		}
		static void UpdateDictionary(Dictionary<int, Tuple<int, int, int>> dict, Tuple<int, int, int> t)
		{
			if (dict.ContainsKey(t.Item1) )
			{
				dict[t.Item1] = t;
			}
			else
				dict.Add(t.Item1, t);
		}
		static void PrintDictionary(string msg, Dictionary<int, Tuple<int, int, int>> dict)
		{
			Console.WriteLine(msg);
			foreach (KeyValuePair<int, Tuple<int, int, int>> x in dict)
			{
				Console.WriteLine("{0} {1} {2}", x.Value.Item1, x.Value.Item2, x.Value.Item3);
			}

		}