Not sorting Ascending

Folks,
In my Access 2016 form I have various fields that when you click on their label it will sort the table Descending. For example, if I clicked on the label Address for the Address control then then table is sorted Descending. What I haven't figured out is if I wanted to then click on the same label it would sort Ascending.

Private Sub Address_Label_Click()
        Me.OrderBy = "Address"
        If Me.OrderBy = "Address" Then
           Me.OrderBy = "Address DESC"
        Else
           Me.OrderBy = "Address"
        End If
End Sub