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    <p>I created a class I called <code>SuspendLatch</code>. Offers on a better name are welcome, but it does what you need and you would use it like this:</p> <pre><code>void Method() { using (suspendLatch.GetToken()) { // Update selected index etc } } void listbox1_SelectedIndexChanged(object sender, EventArgs e) { if (suspendLatch.HasOutstandingTokens) { return; } // Do some work } </code></pre> <p>It's not pretty, but it does work, and unlike unregistering events or boolean flags, it supports nested operations a bit like TransactionScope. You keep taking tokens from the latch and it's only when the last token is disposed that the <code>HasOutstandingTokens</code> returns false. Nice and safe. Not threadsafe, though...</p> <p>Here's the code for SuspendLatch:</p> <pre><code>public class SuspendLatch { private IDictionary&lt;Guid, SuspendLatchToken&gt; tokens = new Dictionary&lt;Guid, SuspendLatchToken&gt;(); public SuspendLatchToken GetToken() { SuspendLatchToken token = new SuspendLatchToken(this); tokens.Add(token.Key, token); return token; } public bool HasOutstandingTokens { get { return tokens.Count &gt; 0; } } public void CancelToken(SuspendLatchToken token) { tokens.Remove(token.Key); } public class SuspendLatchToken : IDisposable { private bool disposed = false; private Guid key = Guid.NewGuid(); private SuspendLatch parent; internal SuspendLatchToken(SuspendLatch parent) { this.parent = parent; } public Guid Key { get { return this.key; } } public override bool Equals(object obj) { SuspendLatchToken other = obj as SuspendLatchToken; if (other != null) { return Key.Equals(other.Key); } else { return false; } } public override int GetHashCode() { return Key.GetHashCode(); } public override string ToString() { return Key.ToString(); } public void Dispose() { Dispose(true); GC.SuppressFinalize(this); } protected virtual void Dispose(bool disposing) { if (!disposed) { if (disposing) { // Dispose managed resources. parent.CancelToken(this); } // There are no unmanaged resources to release, but // if we add them, they need to be released here. } disposed = true; // If it is available, make the call to the // base class's Dispose(Boolean) method //base.Dispose(disposing); } } } </code></pre>
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    1. PODifferentiating between events raised by user interaction and my own code
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    1. USNeil Barnwell
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    1. COMight me me. But is this not a bit overkill - "How can I update my combo box's SelectedItem property without causing the SelectedIndexChanged event to fire?" Please could I have feedback on my solution?
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    2. COIt could be overkill. Setting flags or removing the eventhandler is a simpler solution, but I created my SuspendLatch when I realised I had multiple places where I wanted to suspend the SelectedIndexChanged event
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      1. USNeil Barnwell
    3. CO"Offers on a better name are welcome" -- public class SuspendThingerMajig?
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