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copied!<p>How about the <a href="http://www.sloppycode.net/articles/csharp-design-patterns.aspx#state" rel="nofollow noreferrer">State</a> pattern (<a href="http://en.wikipedia.org/wiki/State_pattern" rel="nofollow noreferrer">wikipedia link</a>)?</p> <pre><code>public abstract class State { /// <summary> /// Holds the current state we're in. /// </summary> public State CurrentState { get; set; } public virtual string Cancelled(State context) { return ""; } public virtual string RequestedByUser(State context) { return ""; } public virtual string RequestedByManager(State context) { return ""; } } public class CancelledState : State { public override string Cancelled(State context) { context.CurrentState = new SittingState(); return "Cancelled."; } public override string RequestedByUser(State context) { context.CurrentState = new RequestedByUserState(); return "Requested by User."; } public override string RequestedByManager(State context) { return "You can't do this before it's been requested by the User"; } } // (RequestedByUserState and RequestedByManagerState classes have been cut out) </code></pre> <p><em>As you can see, the pattern does fit exactly though.</em></p> <p><a href="http://en.wikipedia.org/wiki/Chain-of-responsibility_pattern" rel="nofollow noreferrer">Chain of Responsibility</a> might be also be relevant if there's security concerns. If the wikipedia article makes no sense then <a href="http://www.amazon.co.uk/3-0-Design-Patterns-Judith-Bishop/dp/059652773X/ref=sr_1_4?ie=UTF8&s=books&qid=1216066920&sr=8-4" rel="nofollow noreferrer">this book</a> has a good examples of both. Another is the Command pattern for wizards. None of them fit perfectly but they give you some good ideas to start with.</p>

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