C#

if ((0 <= x) && (x <=5))<br />
else ...

<br />
Switch (int x)<br />
{<br />
Case 0:<br />
Case 1:<br />
Case 2:<br />
Case 3:<br />
Case 4:<br />
Case 5:<br />
//Do processing here.<br />
break;<br />
...<br />
Default:<br />
}<br />
<br />

abstract class AsyncCallback
{
    public void Receive(bool echo)
    {
        if(!echo) { ... erase ... };
    }
}

class MyCallback : AsyncCallback
{
    public override void Receive(bool echo)
    {
        base.Receive(echo);

        // do your own stuff here
    }
}

public delegate void ReceiveHandler(bool echo); 

abstract class AsyncCallback
{
   public event ReceiveHandler Received;

   void IReceivedSomething(bool echo)
   {
      if(!echo) { ... clear ... }
      if(Received != null)
         Received(echo);
   }
}

class MyHandler : AsyncCallback
{
   public MyHandler
   {
       this.Received += new ReceiveHandler(OnReceive);
   }

   public void OnReceive(bool echo)
   {

   }
}

<br />
        private void onExitEvent(object sender, EventArgs e)<br />
        {<br />
                Application.ExitThread(); // Kills the thread on which the current form is running<br />
                <br />
                Thread mainThread = new Thread(new ThreadStart(startRun)); // Create a new thread<br />
                mainThread.SetApartmentState(ApartmentState.STA); // Don't forget to set the                              <br />
                                                                  // apartment state to STA<br />
                mainThread.Start(); // Start the new thread<br />
<br />
        }<br />
        public void startRun()<br />
        {<br />
            Application.Run(new NewForm()); // On the newly creates thread run the application<br />
                                            // creating a NewForm instance<br />
        }<br />