Option Explicit
Sub A_Macro_Sort()
Dim oneRng As Range
Dim aCol As Range
Set oneRng = Range("A1:C500")
Set aCol = Range("A1")
oneRng.Sort Key1:=aCol, Order1:=xlAscending, Header:=xlYes
'oneRng.Sort Key1:=aCol, Order1:=xlDescending, Header:=xlYes
End Sub