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TreeView.OnBeforeSelect Method

Raises the BeforeSelect event.

[Visual Basic]
Protected Overridable Sub OnBeforeSelect( _
   ByVal e As TreeViewCancelEventArgs _
protected virtual void OnBeforeSelect(
 TreeViewCancelEventArgs e
protected: virtual void OnBeforeSelect(
 TreeViewCancelEventArgs* e
protected function OnBeforeSelect(
   e : TreeViewCancelEventArgs


A TreeViewCancelEventArgs that contains the event data.


Raising an event invokes the event handler through a delegate. For more information, see Raising an Event.

The OnBeforeSelect 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 OnBeforeSelect in a derived class, be sure to call the base class's OnBeforeSelect method so that registered delegates receive the event.


Platforms: Windows 98, Windows NT 4.0, Windows Millennium Edition, Windows 2000, Windows XP Home Edition, Windows XP Professional, Windows Server 2003 family

See Also

TreeView Class | TreeView Members | System.Windows.Forms Namespace | BeforeSelect | AfterSelect | OnAfterSelect