using System;

using System.Collections.Generic;

using System.Linq;

using System.Threading.Tasks;

​

class Program

{

    static async Task Main(string[] args)

    {

        // Create a list of tasks

        List<Task<int>> tasks = new List<Task<int>>

        {

            Task1(),

            Task2(),

            Task3()

        };

​

        // Wait for all tasks to complete

        int[] results = await Task.WhenAll(tasks);

​

        // Extract the final result of the tasks

        foreach (int result in results)

        {

            Console.WriteLine($"Task result: {result}");

        }

    }

​

    static async Task<int> Task1()

    {

        await Task.Delay(1000); // Simulate some async work

        return 1;

    }

​

    static async Task<int> Task2()

    {

        await Task.Delay(2000); // Simulate some async work

        return 2;

    }

​

    static async Task<int> Task3()

    {

        await Task.Delay(1500); // Simulate some async work

        return 3;

    }

}

​