conditional hiding of rows and/or columns

Hi,

I'd like to hide rows and/or columns based on some cell contents, after these contents are entered. I fill the cell contents with check-boxes by adding a cell-link from the check-box to a cell.
If the box is checked, the cell shows the value true.


If I want to do this based on one expression I use the VBA Code as follos:
Private Sub Worksheet_Change(ByVal Target As Range)
    Application.ScreenUpdating = False
     ' Dim R As Range
     ' Set R = Application.Intersect (Target, Range("B7:B7"))
     ' If R Is Nothing Then Exit Sub
    With ActiveSheet
        For Each Cell In Range("C7")
            If Cell.Value = "explicit" Then
                Cell.EntireColumn("F").Hidden = True
                Cell.EntireColumn("E").Hidden = True
                Cell.EntireColumn("G").Hidden = False
            Else
                Cell.EntireColumn("G").Hidden = True
                Cell.EntireColumn("E").Hidden = False
                Cell.EntireColumn("F").Hidden = False
            End If
            Next
    End With
    Application.ScreenUpdating = True
End Sub
---

Now I'd like to add something like this:
    With ActiveSheet
        For Each Cell In Range("C11")
            If Cell.Value = "true" Then
                Cell.EntireColumn("I").Hidden = True
            Else
                Cell.EntireColumn("I").Hidden = False
            End If
----
Unfortunately I don't know how (my last code might be totally wrong).
Please advise.