ComboBox.OnDropDown(EventArgs) Method
Definition
Important
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Raises the DropDown event.
protected:
virtual void OnDropDown(EventArgs ^ e);protected virtual void OnDropDown (EventArgs e);abstract member OnDropDown : EventArgs -> unit
override this.OnDropDown : EventArgs -> unitProtected Overridable Sub OnDropDown (e As EventArgs)Parameters
Remarks
This event is raised each time the drop-down is displayed.
Raising an event invokes the event handler through a delegate. For more information, see Handling and Raising Events.
The OnDropDown method also allows derived classes to handle the event without attaching a delegate. This is the preferred technique for handling the event in a derived class.
Notes to Inheritors
When overriding OnDropDown(EventArgs) in a derived class, be sure to call the base class's OnDropDown(EventArgs) method so that registered delegates receive the event.
