Problem with Async method

[PetroProtsyk]

While using RunCode in combination of Event handlers being invoked from background thread side effects are possible. In the example below exception will appear because context will be clear immediately after call to RunCode, but will be still referenced and used by the event handler which will be invoked afterwards as a result of async function execution:

[TestMethod]
public void ProblemWithGlobalScopeWithAsyncEvents() {
    CustomerFacade rez = (CustomerFacade)Script.RunCode(@"
        abc = '123';
        function OnGetCustomersCompleted(s, e)
        {
            s.v = abc;
        }

        s = new CustomerFacade();
        s.GetCustomersCompleted += OnGetCustomersCompleted;
        s.GetCustomersAsync();

        return s;
     ");

    //Now scope is clear, while event is still subscribed and will be invoked
    while (rez.busy) System.Threading.Thread.Sleep(100);
    Assert.IsTrue(rez.v.Contains("given handler is not associated with any context"));
}

public class CustomerFacade {

  public event EventHandler<EventArgs> GetCustomersCompleted;

  public string v { get; set; }

  public bool busy { get; set; }

  public void GetCustomersAsync()
  {
      busy = true;

      Task t = Task.Factory.StartNew(
          () => {
              System.Threading.Thread.Sleep(500);

              try {
                  if (GetCustomersCompleted != null) {
                      GetCustomersCompleted.Invoke(this, EventArgs.Empty);
                  }
              }
              catch(Exception e)
              {
                  v = e.ToString();
              }
              finally {
                  busy = false;
              }
          });
  }

}