using System;

using System.Collections.Generic;

using System.Linq.Expressions;

​

public class Program

{

        public async Task DownloadDataAsync()

        {

            try

            {

                Console.WriteLine("Download1 started");

                throw new InvalidOperationException("Simulated download error");

                await Task.Delay(5000);

                Console.WriteLine("Download1 completed  ");

            }

            catch (Exception ex)

            {

                Console.WriteLine("Errrrrrorrr:   " + ex.Message);

            }

        }

​

    public async Task DownloadDataAsync2()

    {

        Console.WriteLine("Download2 started");

​

        await Task.Delay(3000);

        Console.WriteLine("Download2 completed  ");

    }

​

    public static async Task Main(string[] args)

    {

        Program program = new Program();

        Task Task1 = program.DownloadDataAsync();

        Task Task2 = program.DownloadDataAsync2();

        await Task.WhenAll(Task1, Task2);

        Console.WriteLine("Program download complete");

​

    }

}