using System;

using System.Linq;

using System.Threading.Tasks;

​

public class Program

{

    public static async Task<string> DoSomethingAsync(int i)

    {

        await Task.Delay(10);

        return i.ToString();

    }

​

    public static void Main()

    {

        var random = new Random();

        var tasks = Enumerable.Range(0, 100).Select(x => DoSomethingAsync(random.Next(5)));

        var results = Task.WhenAll(tasks).Result;

        var groups = results.GroupBy(x => x).Select(x => new

        {

        x.Key, Count = x.Count()}

​

        );

        foreach (var group in groups)

        {

            Console.WriteLine(group.Key + " " + group.Count);

        }

    }

}