test.cs

Console.WriteLine("Number of instances: {0}", serverTextControlFactory.Count);

for (int i = 0; i < 5; i++) {
    ServerTextControl tx = serverTextControlFactory.CreateServerTextControl();
    Console.WriteLine("Number of instances: {0}", serverTextControlFactory.Count);
}

Console.WriteLine("Disposed instances: {0}", serverTextControlFactory.DisposeAll());