ToolStripDropDown::OnOpening Method (CancelEventArgs^)
.NET Framework (current version)
Raises the Opening event.
Assembly: System.Windows.Forms (in System.Windows.Forms.dll)
Parameters
- e
-
Type:
System.ComponentModel::CancelEventArgs^
A CancelEventArgs that contains the event data.
Raising an event invokes the event handler through a delegate. For more information, see Handling and Raising Events.
The OnOpening 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 OnOpening in a derived class, be sure to call the base class's OnOpening method so that registered delegates receive the event.
.NET Framework
Available since 2.0
Available since 2.0
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