Occurs when changes occur that affect whether or not the command should execute.
Syntax
public event EventHandler CanExecuteChanged
Remarks
Normally, a command source calls ICommand.CanExecute(object) on the command when this event occurs.
Normally, if the command cannot execute, the command source disables itself.
Requirements
Namespace: System.Windows.Input
Assembly: System (in System.dll)
Assembly Versions: 4.0.0.0
Assembly: System (in System.dll)
Assembly Versions: 4.0.0.0