If there is a button within a group box on a win form, and when the “click” event occurs, then who is actually calling the Event. Is it the button contorl or its parent i.e. GroupBox.
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If there is a button within a group box on a win form, and when the “click” event occurs, then who is actually calling the Event. Is it the button contorl or its parent i.e. GroupBox.
If you’d have written a native Windows GUI program then it would be the group box that got the click message. Buttons send notification to their parents. But that gets re-routed in Winforms, both through sub-classing and having the container window reflect messages back to the child control.
Events always originate at the control. Their OnClick() method in case of a click. You however still handle the event at a higher level window. Typically the form, not the groupbox. The sender argument of the event handler passes a reference to the control. Having a choice over exactly where you handle the event is a major advantage over the native way. It makes controls highly adaptable and composable.