using System;

using System.Threading.Tasks;

public class Program

{

    public  static void Main()

    {

        MyAsyncMethod();

    }

    private static async void MyAsyncMethod()

{

    Task[] taskArray = {

        Task.Factory.StartNew(() => ExecuteConcurrentTasks(1).Result),

        Task.Factory.StartNew(() => ExecuteConcurrentTasks(2).Result),

        Task.Factory.StartNew(() => ExecuteConcurrentTasks(3).Result),

        Task.Factory.StartNew(() => ExecuteConcurrentTasks(4).Result)

    };

    Task.WaitAll(taskArray);

    string s1 = ((Task<string>)taskArray[0]).Result;

    string s2 = ((Task<string>)taskArray[1]).Result;

    string s3 = ((Task<string>)taskArray[2]).Result;

    string s4 = ((Task<string>)taskArray[3]).Result;

}

​

​

​

private static async Task<string> ExecuteConcurrentTasks(int passedInt)

{

    string s = "Result: " + passedInt.ToString();

​

    if (passedInt == 4)

    {

        Console.WriteLine(s);

    }

    else if (passedInt == 3)

    {

        Console.WriteLine(s);

    }

    else if (passedInt == 2)

    {

        Console.WriteLine(s);

    }

    else if (passedInt == 1)

    {

        Console.WriteLine(s);

    }

​

    return s;

}

​

}