Control Names

that might cause conflicts if there are more TextBoxes on the form with other uses. If you perfer to use Matthew Gate's solution, I suggest you consider "tagging" the objects you want to work with.

Dim ctl as Control

For Each ctl In Controls
    If TypeOf ctl Is TextBox Then
        If ctl.Tag = "TAGGED" Then
            'Do your code here
        End if
    End if
Next ctl