VBA - Hide/unhide row based on hidden/unhidden status of another row - vba

Question

I'm trying to write some VBA code that will unhide an entire row if another specific row is hidden. This macro also hides a range of rows based on the value in a specific column. This aspect works fine - I have reliable code. I can't get the first function I described to work. Should be easy to do, just don't know the syntax. This subroutine should execute upon opening the workbook.
Private Sub Workbook_Open()
Application.ScreenUpdating = False
Dim targ As Range
Dim msg As Range
targ = "DETAILS!B6"
msg = "DETAILS!B42"
msg.EntireRow.Hidden = True
With Range("DETAILS!B6:B40")
.EntireRow.Hidden = False
For Each cell In Range("DETAILS!B6:B40")
Select Case cell.Value
Case Is = 0
cell.EntireRow.Hidden = True
End Select
Next cell
End With
If targ.EntireRow.Hidden = True Then
msg.EntireRow.Hidden = False
End If
Application.ScreenUpdating = True
End Sub

Answer 1

You need to set the variables like below
Private Sub Workbook_Open()
Application.ScreenUpdating = False
Dim targ As Range
Dim msg As Range
Set targ = "DETAILS!B6"
Set msg = "DETAILS!B42"
msg.EntireRow.Hidden = True
With Range("DETAILS!B6:B40")
.EntireRow.Hidden = False
For Each cell In Range("DETAILS!B6:B40")
Select Case cell.Value
Case Is = 0
cell.EntireRow.Hidden = True
End Select
Next cell
End With
If targ.EntireRow.Hidden = True Then
msg.EntireRow.Hidden = False
End If
Application.ScreenUpdating = True
End Sub

Answer 2

Oh! Just put Set before targ and msg since they're a Range. When declaring ranges, you have to have Set, i.e. Set myRng = Range("A1:A10").
You might need to do Set targ = Range("Details!B6") if just Set Targ = "DetailsB6" doesn't work.
On second thought, I don't think Set Targ = "Details!B6" will work if you are Dim Targ as Range. You're dim'ing as a Range, but are declaring it as like a string. You need this to be a Range, to use it like targ.EntireRow.Hidden, etc.

Answer 3

Though you can call range objects like this : Range("DETAILS!B6:B40")
In vba it is better accepted to call it like this: Sheets("DETAILS").Range("B6:B40")
I fixed a few more syntax errors:
Private Sub Workbook_Open()
Application.ScreenUpdating = False
Dim targ As Range
Dim msg As Range
Set targ = Sheets("DETAILS").Range("B6")
Set msg = Sheets("DETAILS").Range("B42")
msg.EntireRow.Hidden = True
With Sheets("DETAILS").Range("B6:B40")
.EntireRow.Hidden = False
End With
For Each cell In Sheets("DETAILS").Range("B6:B40")
Select Case cell.Value
Case 0
cell.EntireRow.Hidden = True
End Select
Next cell
If targ.EntireRow.Hidden = True Then
msg.EntireRow.Hidden = False
End If
Application.ScreenUpdating = True
End Sub