Flipping Or Mirroring A Range

This macro will reverse the order of a range of data.  You may flip data in a single row or in a single column of data (i.e., an N by 1 array or an 1 by N array).   You may not select and entire row or an entire column.
Public Sub FlipSelection()

Dim Arr() As Variant
Dim Rng As Range
Dim C As Range
Dim Rw As Long
Dim Cl As Long

On Error GoTo EndMacro

Application.ScreenUpdating = False
Application.Calculation = xlCalculationManual
Application.EnableEvents = False

Set Rng = Selection
Rw = Selection.Rows.Count
Cl = Selection.Columns.Count
If Rw > 1 And Cl > 1 Then
   MsgBox "Selection May Include Only 1 Row or 1 Column", _
    vbExclamation, "Flip Selection"
Exit Sub
End If

If Rng.Cells.Count = ActiveCell.EntireRow.Cells.Count Then
    MsgBox "You May Not Select An Entire Row", vbExclamation, _
        "Flip Selection"
    Exit Sub
End If
If Rng.Cells.Count = ActiveCell.EntireColumn.Cells.Count Then
    MsgBox "You May Not Select An Entire Column", vbExclamation, _
        "Flip Selection"
    Exit Sub
End If

If Rw > 1 Then
    ReDim Arr(Rw)
Else
    ReDim Arr(Cl)
End If

Rw = 0
For Each C In Rng
    Arr(Rw) = C.Formula
    Rw = Rw + 1
Next C

Rw = Rw - 1
For Each C In Rng
    C.Formula = Arr(Rw)
    Rw = Rw - 1
Next C

EndMacro:
Application.ScreenUpdating = True
Application.Calculation = xlCalculationAutomatic
Application.EnableEvents = True

End Sub