View. On Key Up(KeyEventArgs) Method
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protected: override void OnKeyUp(System::Windows::Forms::KeyEventArgs ^ e);
protected override void OnKeyUp (System.Windows.Forms.KeyEventArgs e);
override this.OnKeyUp : System.Windows.Forms.KeyEventArgs -> unit
Protected Overrides Sub OnKeyUp (e As KeyEventArgs)
Raising an event invokes the event handler through a delegate. For more information, see Handling and Raising Events.
The OnKeyUp 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.