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ButtonBase.OnMouseDown(MouseEventArgs) Method


Raises the OnMouseDown(MouseEventArgs) event.

 override void OnMouseDown(System::Windows::Forms::MouseEventArgs ^ mevent);
protected override void OnMouseDown (System.Windows.Forms.MouseEventArgs mevent);
override this.OnMouseDown : System.Windows.Forms.MouseEventArgs -> unit
Protected Overrides Sub OnMouseDown (mevent As MouseEventArgs)



A MouseEventArgs that contains the event data.


Raising an event invokes the event handler through a delegate. For more information, see Handling and Raising Events.

The OnMouseDown 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.


Do not call OnMouseDown if the button is disabled (this includes calls to the base class's OnMouseDown method when you override OnMouseDown in a derived class). When disabling the button in an override of OnMouseDown, call the base class's OnMouseDown method before disabling the button, or do not call it at all.

Notes to Inheritors

When overriding OnMouseDown(MouseEventArgs) in a derived class, be sure to call the base class's OnMouseDown(MouseEventArgs) method so that registered delegates receive the event.

Applies to

See also