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copied!<p>I don't think there's anything wrong with what you want to do. For the most part, I suspect that the <code>object sender</code> parameter remains in order to continue to support pre 2.0 code.</p> <p>If you really want to make this change for a public API, you might want to consider creating your own base EvenArgs class. Something like this:</p> <pre><code>public class DataEventArgs<TSender, TData> : EventArgs { private readonly TSender sender, TData data; public DataEventArgs(TSender sender, TData data) { this.sender = sender; this.data = data; } public TSender Sender { get { return sender; } } public TData Data { get { return data; } } } </code></pre> <p>Then you can declare your events like this</p> <pre><code>public event EventHandler<DataEventArgs<MyClass, int>> SomeIndexSelected; </code></pre> <p>And methods like this:</p> <pre><code>private void HandleSomething(object sender, EventArgs e) </code></pre> <p>will still be able to subscribe.</p> <p><strong>EDIT</strong></p> <p>That last line made me think a bit... You should actually be able to implement what you propose without breaking any outside functionality since the runtime has no problem downcasting parameters. I would still lean toward the <code>DataEventArgs</code> solution (personally). I would do so, however knowing that it is redundant, since the sender is stored in the first parameter and as a property of the event args.</p> <p>One benefit of sticking with the <code>DataEventArgs</code> is that you can chain events, changing the sender (to represent the last sender) while the EventArgs retains the original sender.</p>

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