C#

Dictionary<Keys,int>m_keys = new Dictionary<Keys,int>();
Windows.Forms.Timer m_timer = new Windows.Forms.Timer();
const int initialWait = 10;
const int repeatWait = 10;
const int overPeriod = 100; // msec
 
public Constructor() {
    m_timer.Interval=initialWait;
    m_timer.Start();
    m_timer.Tick += new EventHandler(autoRepeatTick);
}
 
private void m_KeyDown(object sender, KeyEventArgs e) {
    Keys key=e.KeyCode;
    handleKey(key);
    if (keys.ContainsKey(key)) {
        m_keys[key]=overClocking;
    } else {
        m_keys.Add(key, overClocking);
    }
}
 
private void m_KeyUp(object sender, KeyEventArgs e) {
    keys.Remove(e.KeyCode);
}
 
private void autoRepeatTick(object sender, ElapsedEventArgs e) {
    // you may add code here to disable autorepeat while form not active!
    foreach (Keys key in m_keys.Keys) {
        int wait=m_keys[key]-1;
 	if (wait<=0) {
	        handleKey(key);
		wait=repeatWait;
	}
	m_keys[key]=wait;
    }
}
 
private void handleKey(Keys key) {
    ... game code
}