Practical example where Tuple can be used in .Net 4.0?

Question

I have seen the Tuple introduced in .Net 4 but I am not able to imagine where it can be used. We can always make a Custom class or Struct.

Answer 1

I used a tuple to solve Problem 11 of Project Euler:

class Grid
{
    public static int[,] Cells = { { 08, 02, 22, // whole grid omitted

    public static IEnumerable<Tuple<int, int, int, int>> ToList()
    {
        // code converts grid to enumeration every possible set of 4 per rules
        // code omitted
    }
}

Now I can solve the whole problem with:

class Program
{
    static void Main(string[] args)
    {
        int product = Grid.ToList().Max(t => t.Item1 * t.Item2 * t.Item3 * t.Item4);
        Console.WriteLine("Maximum product is {0}", product);
    }
}

I could have used a custom type for this, but it would have looked exactly like Tuple.