Excel Argument notation

Hi I need to specify the columns of a Spreadsheet using arguments. This is what I need:

("B2:B38,C2:C122")

And this is what I have

Code:

---

Dim Columns As String
CellEnd = 122   
CellBeg = 38

Columns = (("B" & CellBeg & ":" & "B" & CellEnd)) & _
          (("C" & CellBeg & ":" & "C" & CellEnd))

---

When I execute this line the result is Columns = ("B2:B38C2:C122")
I DO NOT get the coma in between and that is giving me an error. What will be the right format to get this right? I am still trying to solve it.
Thanks

Sorry for bothering, but I tried

Columns = (("B" & GraphCellBeg & ":" & "B" & GraphCellEnd)) & "," & _
(("C" & GraphCellBeg & ":" & "C" & GraphCellEnd))

and it looks like it worked. Thanks anyway