Task2.cs

using System.Timers;

public class AsyncCaller : IAsyncDisposable
{
    private System.Timers.Timer _timer;
    private readonly CancellationTokenSource _tokenSource;
    private readonly EventHandler _handler;
    private bool _completedOk;
  
    public AsyncCaller(EventHandler h)
    {
        _tokenSource = new CancellationTokenSource();
        _handler = h;
        _timer = null!;
        _tokenSource.Token.Register(() => _completedOk = false);
    }

    private void OnTimedEvent(object? sender, ElapsedEventArgs e) => _tokenSource.Cancel();

    public bool Invoke(int milliseconds, object? sender, EventArgs eventArgs)
    {
        _completedOk = false;
        _timer = new System.Timers.Timer(milliseconds);
        _timer.Elapsed += OnTimedEvent;
        _timer.Enabled = true;

        var asyncResult = _handler.BeginInvoke(null, EventArgs.Empty, null, null);
        while (asyncResult.IsCompleted)
        {
            if (_tokenSource.Token.IsCancellationRequested) return false;
            Thread.Sleep(50);
        }
        
        _handler.EndInvoke(asyncResult);
        _completedOk = true;

        return _completedOk;
    }

    public async ValueTask DisposeAsync()
    {
        _timer.Dispose();
        _tokenSource.Dispose();
        GC.SuppressFinalize(this);
    }
}