using System;

using System.Threading.Tasks;

using System.Diagnostics;

​

var t = new Tests();

t.Execute();

await t.ExecuteAsync();

​

Console.ReadLine();

​

​

class User

{

    public string Name { get; set; }

}

​

​

class Tests

{

    public void Execute()

    {

        int a = 5;

        Test1(a);

        Console.WriteLine(a);

​

        var u1 = new User { Name = "Ion" };

        Test1(u1);

        Console.WriteLine(u1.Name);

​

        var u2 = new User { Name = "Ion" };

        Test2(u2);

        Console.WriteLine(u2.Name);

    }

​

    public async Task ExecuteAsync()

    {

        var stopwatch = new Stopwatch();

​

        stopwatch.Start();

​

        await Task.Delay(1000);

        await Task.Delay(2000);

        await Task.Delay(3000);

​

        stopwatch.Stop();

​

        Console.WriteLine("Elapsed Time is {0} ms", stopwatch.ElapsedMilliseconds);

    }

​

    void Test1(int a)

    {

        a = 10;

    }

​

    void Test1(User u)

    {

        u.Name = "Gheorghe";

    }

​

    void Test2(User u)

    {

        u = new User { Name = "Gheorghe" };

    }

}

​

​