Valamas

You cannot when you use both

Cor

I must be missing something because the obvious DRY (Do not
Repeat Yourself) solution is:

Public Overloads Sub SetNodeImageIndex( _
   ByVal oNode As System.Windows.Forms.TreeNode, _
   ByVal ImageIndex As String _
)
   ' Delegate actual work to one common method
   SetNodeImageIndexCommon(oNode, CInt(ImageIndex))
End Sub

Protected Overloads Sub SetNodeImageIndex( _
 ByVal e As System.Windows.Forms.TreeViewCancelEventArgs, _
 ByVal ImageIndex As Long _
)
  ' Delegate actual work to one common method
  SetNodeImageIndexCommon(e.Node, CInt(ImageIndex))
End Sub

Private Sub SetNodeImageIndexCommon( _
   ByVal oNode As System.Windows.Forms.TreeNode, _
   ByVal ImageIndex As Integer _
)
   ' Do actual work in only one place
   oNode.ImageIndex = ImageIndex
   oNode.SelectedImageIndex = ImageIndex
End Sub

Or even

Public Overloads Sub SetNodeImageIndex( _
   ByVal oNode As System.Windows.Forms.TreeNode, _
   ByVal ImageIndex As String _
)
   ' Do actual work in only one place
   oNode.ImageIndex = CInt(ImageIndex)
   oNode.SelectedImageIndex = CInt(ImageIndex)
End Sub

Protected Overloads Sub SetNodeImageIndex( _
 ByVal e As System.Windows.Forms.TreeViewCancelEventArgs, _
 ByVal ImageIndex As Long _
)
   ' Delegate actual work to one common method
   SetNodeImageIndex(e.Node, CStr(ImageIndex))
End Sub
'Any fool can write code that a computer can understand.
Good programmers write code that humans can understand.'
Martin Fowler,
'Refactoring: improving the design of existing code', p.15