using System;

using System.Threading;

using System.Threading.Tasks;

public class Program

{

    public async static Task Main()

    {

        var thing = new TestClass();

        thing.Thread1();

        await thing.Thread2();

        Console.WriteLine("Done");

    }

}

​

​

public class TestClass

{

    public async Task Thread1()

    {

        await Task.Delay(1000);

        Console.WriteLine("Thread1");

    }

​

    public async Task Thread2()

    {

        await Task.Delay(200);

        Console.WriteLine("Thread2");

    }

}