Tuples.cs

using System;
using System.Collections.Generic;
class Program
{
    static void Main(string[] args)
    {
        List<Tuple<string, string>> list = new List<Tuple<string, string>>();
        list.Add(new Tuple<string, string>("fruit", "apple"));
        list.Add(new Tuple<string, string>("fruit", "peach"));
        list.Add(new Tuple<string, string>("vegetable", "carrot"));
        list.Add(new Tuple<string, string>("vegetable", "broccoli"));
        foreach (var item in list)
        {
            Console.WriteLine("category: " + item.Item1 + ", example: " + item.Item2);
        }
    }
}