Session is not declared Error

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VB

I have the following code:

Try
            Select Case process.datain
                Case "home"
                    MOTable = selectMO(process.mo, process.mt)
                    If MOTable.Rows.Count() = 0 Then
                        If insertMO(process.mo, process.mt) Then
                            writeMsg("1 MO inserted/updated at ")
                            session("msg") = msgTable.Rows(7)(1).ToString()
                            MsgBox(session("msg"))
                        Else
                            writeMsg("1 MO could not be inserted at ")
                        End If
 Catch ex As Exception
            logFile("executeTimer ----" & ex.Message)
        Finally
            updateProcessed(process.id,session("msg"))
        End Try

I'm facing an error telling me that session is not declared... but i need to use a session to get the value of the row because i need to pass it later on at the end of the code as parameter for a stored procedure. I even tried using :

session.add("msg", msgTable.Rows(7)(1).ToString())

but i'm facing the same error

Can you help me please?

[EDIT]: Shouting removed