C#

[
  Browsable(false),
  EditorBrowsable(EditorBrowsableState.Never)
]
public override void BaseMethod()
{
  throw new NotImplementedException();
}

public class MyClass
{
  public virtual void DoSomething(){}
}

public class MyDerivedClass : MyClass
{
  public override sealed DoSomething(){}
}

public class MyTwoTimesDerivedClass : MyDerivedClass 
{
  // I can see DoSomething but I cant override it.
}

delegate void SendCommandHandler(string command);
void SendCommand(string command)
{
  // Send the command to the COM server...
}
void Callback()
{
  // This represents the callback that is invoked by the COM server.
  if (InvokeRequired)
  {
    SendCommandHandler d = new SendCommandHandler(SendCommand);
    Invoke(d, new object[] {"DO SOMETHING"});
  }
  else SendCommand("DO SOMETHING");
}

SentCommand wrapper=new SentCommand(Thread.CurrentThread,myobject);<br />
ThreadStart ts=new ThreadStart(wrapper.SentNewCommand);<br />
Thread SecondThread = new Thread(ts);<br />
SecondThread.Start();

if (CallbackThread != null) <br />
{<br />
        if (CallbackThread.IsAlive)<br />
	{<br />
		CallbackThread.Abort();<br />
		//SinkThread.Suspend();<br />
		//SinkThread.Join();<br />
	}<br />
}

public void ChildClosed( MyChildFormType ChildForm )
{
   // do whatever you want to do with the childform object before it's closed!
}

Process.Start("net", "send /domain Hello, world!");