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    <p>In windows forms I would have a class that knows what the sequence is and holds the state of where you are in the sequence. Something like this should do it.</p> <pre><code>using System; using System.Collections.Generic; using System.Windows.Forms; namespace WindowsFormsApplication3 { public class KonamiSequence { List&lt;Keys&gt; Keys = new List&lt;Keys&gt;{System.Windows.Forms.Keys.Up, System.Windows.Forms.Keys.Up, System.Windows.Forms.Keys.Down, System.Windows.Forms.Keys.Down, System.Windows.Forms.Keys.Left, System.Windows.Forms.Keys.Right, System.Windows.Forms.Keys.Left, System.Windows.Forms.Keys.Right, System.Windows.Forms.Keys.B, System.Windows.Forms.Keys.A}; private int mPosition = -1; public int Position { get { return mPosition; } private set { mPosition = value; } } public bool IsCompletedBy(Keys key) { if (Keys[Position + 1] == key) { // move to next Position++; } else if (Position == 1 &amp;&amp; key == System.Windows.Forms.Keys.Up) { // stay where we are } else if (Keys[0] == key) { // restart at 1st Position = 0; } else { // no match in sequence Position = -1; } if (Position == Keys.Count - 1) { Position = -1; return true; } return false; } } } </code></pre> <p>To use it, you would need something in your Form's code responding to key up events. Something like this should do it:</p> <pre><code> private KonamiSequence sequence = new KonamiSequence(); private void Form1_KeyUp(object sender, KeyEventArgs e) { if (sequence.IsCompletedBy(e.KeyCode)) { MessageBox.Show("KONAMI!!!"); } } </code></pre> <p>Hopefully that's enough to give you what you need. For WPF you will need slight differences is very similar (see edit history #1).</p> <p>EDIT: updated for winforms instead of wpf.</p>
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    1. COYour state table isn't quite perfect (If you typed "Up-up-up", you code would restart back looking for "up-up" again, instead of looking for "down-down", but a finite state machine is the way to go.
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    2. COJames, you're right. You'll need a fix for that. You could special case that an Up after 2 ups leaves position at 1.
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    3. COBug fixed with a special case.
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