using System;

using System.Threading.Tasks;

public class Program

{

    public static void Main()

    {

        Console.WriteLine("First Example for async return task function");

        Console.WriteLine(1);

        var t = FuncAsync();

        Console.WriteLine(2);

        var res = t.Result;

        Console.WriteLine("res="+res);

        Console.WriteLine("Second Example for NOT async return task at the same place that the async function");

        Console.WriteLine(1);

        var t2 = FuncTask();

        Console.WriteLine(2);

        var res2 = t2.Result;

        Console.WriteLine("res="+res2);

        Console.WriteLine("Third Example for NOT async return task at the beginning of the function !");

        Console.WriteLine(1);

        var t3 = FuncTotalTask();

        Console.WriteLine(2);

        var res3 = t3.Result;

        Console.WriteLine("res="+res2);

    }

    public static async Task<int> FuncAsync(){

        Console.WriteLine(1.1);

        await Task.Delay(3000);

        Console.WriteLine(1.2);

        return 3;

    }

    public static Task<int> FuncTask(){

        Console.WriteLine(1.1);

        return Task.Delay(3000).ContinueWith(t => {

            Console.WriteLine(1.2);

        return 3;

        });

    }

    public static Task<int> FuncTotalTask(){

        return Task.Run(()=> Console.WriteLine(1.1))

            .ContinueWith(t => Task.Delay(3000)).ContinueWith(t => {

            Console.WriteLine(1.2);

        return 3;

        });

    }

}