using System;

using System.Collections.Generic;

using System.Linq;

​

public class Program

{

    public static void Main()

    {

        List<string> colors = new List<string>();

        colors.Add("green");

        colors.Add("blue");

        colors.Add("yellow");

        colors.Add("green");

        colors.Add("yellow");

        IEnumerable<IGrouping<string, List<string>>> groupedColors = colors.GroupBy(c => c, (key, result) => new

        {

        Color = key, Count = result.Count()}

​

         )

        ;

        foreach (var group in groupedColors)

        {

            Console.WriteLine(string.Format("Key (Color): {0}tCount: {1}", group.Color, group.Count));

        }

    }

}