title: How do you handle an event raised in your class inside your own class?
body: <p>I have a "partial" class in VB.NET.  Half of it is auto generated by a code generation tool.  That half implements INotifyPropertyChanged, so any properties in that part of the partial class raise the PropertyChanged event.</p>
  
  <p>In my "custom" part of the class, I declare another property that depends on one of the properties in the auto-generated side.  Therefore, when that auto-generated property changes, I also want to raise a PropertyChanged event on my custom property that depends on it.</p>
  
  <p>If I go into the generated part of the class and raise the event there, that will get overwritten if I ever re-generate that part, so I don't want to do that.  I would rather add an event handler in my side of the partial class that checks if the generated property changed, and if so, raise another event for my custom property.</p>
  
  <p>I'm trying to write this to hook my own event, but it's not working:</p>
  
  <pre><code>Private Sub MyProperty_PropertyChangedHandler( _
          ByVal sender As Object, ByVal e As PropertyChangedEventArgs _
          ) Handles Me.PropertyChanged
      Select Case e.PropertyName
          Case "AutoGenProperty"
              RaiseEvent PropertyChanged(Me, _
                  New PropertyChangedEventArgs("MyProperty"))
      End Select
  End Sub
  </code></pre>
  
  <p>I'm assuming it's because normally you'd use the WithEvents keyword to tell the compiler that you're subscribing to events from that object.  I don't have a clue how to do this inside of the class that's actually raising the event, or if that's even possible.</p>