How to implement AutoResetEvent with Return Value ability?

Question

I need to call WaitOne() at one place of code and call Set() at 2 another places.

It is related with chromiumwebbrowser and I'm making fulfilling of operations synchronously.

Place 1 - where browser operation is called. Place 2 - where browser status is changed to IsLoading = false. Place 3 - browsers error event handler, where I know about appearing errors while called opperation is performing. When I found error, I need to throw exception after Wait()

I need to send data about errors from Place 3 to Place 1

All this functionality I implemented in code bellow.

Place 1 receive information from Place 2 and 3 by private _message variable, but inside one class.

I just tryed to find temporary solution but I feel that people already faced with this case before and completed solutions already exists.

Can you:

• give me advises about completed solutions for my perposes

• give me advises for improving of my solution

  public class CustomAutoResetEvent { int? _waitTimeout = null;

    public CustomAutoResetEvent(int? waitTimeout = null)
    {
        _waitTimeout = waitTimeout;
    }
  
    // it is made for considiration of setting from many points
    // if event is setted from one point, another point doesn't change state
    bool _isSetted = false;
    AutoResetEvent _autoResetEvent = new AutoResetEvent(false);
  
    string _message { get; set; } = null;
    public void WaitOneThrow()  // Place 1
    {
        _isSetted = false;
        if (_waitTimeout==null)
            _autoResetEvent.WaitOne();
        else
            _autoResetEvent.WaitOne(_waitTimeout.Value);
  
        if (!string.IsNullOrEmpty(_message))
        {
            string msg = null;
            msg = _message;
            _message = null;
  
            //if (msg == "ERR_ABORTED")
            //    return;
  
            throw new Exception(msg);
        }
    }
  
    public void Set(string errMessage = null) // Place 2, 3
    {
        if (!_isSetted)
        {
             _message = errMessage;
            _autoResetEvent.Set();
            _autoResetEvent.Reset();
            _isSetted=true;
        }
    }
  

  }