using System;

using System.Threading.Tasks;

​

public class Program

{

    static async Task Main(string[] args)

    {

        Task<int> result1 = LongProcess1();

        Task<int> result2 = LongProcess2();

        //do something here

        Console.WriteLine("After two long processes.");

        int val = await result1; // wait untile get the return value

        DisplayResult(val);

        val = await result2; // wait untile get the return value

        DisplayResult(val);

        Console.ReadKey();

    }

​

    static async Task<int> LongProcess1()

    {

        Console.WriteLine("LongProcess 1 Started");

        await Task.Delay(4000); // hold execution for 4 seconds

        Console.WriteLine("LongProcess 1 Completed");

        return 10;

    }

​

    static async Task<int> LongProcess2()

    {

        Console.WriteLine("LongProcess 2 Started");

        await Task.Delay(4000); // hold execution for 4 seconds

        Console.WriteLine("LongProcess 2 Completed");

        return 20;

    }

​

    static void DisplayResult(int val)

    {

        Console.WriteLine(val);

    }

}