using System;

using System.Threading.Tasks;

using System.Runtime;

public class Program

{

    public struct S : IDisposable

    {

        private bool dispose;

        public void Dispose()

        {

            dispose = true;

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

        }

        public bool GetDispose() => dispose;

    }

private static string result;

​

 static void Main() {

   SaySomething();

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

     var s = new S();

     using(s)

     {

        Console.WriteLine(s.GetDispose());

     }

     Console.WriteLine(s.GetDispose());

 }

​

 static async Task<string> SaySomething() {

    await Task.Delay(5);

     Console.WriteLine("ddddd");

        result = "Hello world!";

        return "Something";

 }

}