#499 – Interacting with the Control That Initiated an Event

In WPF, you do not have to provide a name for every control in your user interface.  Since so much is accomplished through data binding, you often don’t need to interact with a control at all from your code.

But one scenario where you might want to interact with a control is from an event handler for an event that the control initiated.  Every event handler will have a sender argument that represents the control that fired the event.  You can cast this argument to the appropriate type to get at the original control.

<Button Content="Click Me" HorizontalAlignment="Center" Padding="10,5" Margin="10"
        private void Button_Click(object sender, RoutedEventArgs e)
            Button b = sender as Button;
            b.Width = b.ActualWidth + 1;

About Sean
Software developer in the Twin Cities area, passionate about .NET technologies. Equally passionate about my own personal projects related to family history and preservation of family stories and photos.

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