Public ReadOnly Property IsEmpty As Boolean

public bool IsEmpty {get;}

using (WaitAndContinueWorker work = new WaitAndContinueWorker())
{
    work.OnError += delegate(object o, ErrorEventArgs e) { throw new Exception("Failed.", e.GetException()); };

    SampleWork item = new SampleWork();
    work.AddWork(item);

    Assert.IsFalse(work.IsEmpty);
    work.Abort();

    Assert.IsFalse(item.Completed);
    Assert.IsTrue(item.Disposed);
}

Using work As New WaitAndContinueWorker()
    work.OnError += Function(o As Object, e As ErrorEventArgs) Do
        Throw New Exception("Failed.", e.GetException())
    End Function

    Dim item As New SampleWork()
    work.AddWork(item)

    Assert.IsFalse(work.IsEmpty)
    work.Abort()

    Assert.IsFalse(item.Completed)
    Assert.IsTrue(item.Disposed)
End Using