VB Dynamic streamwriter name from a file

[fj1200]

building another command-line app and I need to generate a log file and write to it throughout the app's run, but the log needs to be named <work_order>_<device>.log - both of those are held in a text file and will change frequently.

I can extract them no problem, and use them in the log file, but can't get the log file to use them in the name.

so I have:

            Using strDATA As New StreamReader(DATA_FILE)
                Do While Not strDATA.EndOfStream
                    Dim eng As String() = Split(strDATA.ReadLine, "=")

                    Select Case eng(0)
                        Case "DEV" : DEVICE = eng(1)
                        Case "WOID" : WORK_ORDER = eng(1)
                        Case(...lots of other junk...)
                        Case Else
                    End Select
                Loop

                LOG = PATH & WORK_ORDER & "_" & DEVICE & ".log"
                TMP = PATH & WORK_ORDER & "_" & DEVICE & ".tmp"
                CSV = PATH & WORK_ORDER & "_" & DEVICE & ".csv"

                Static swMergeLog As StreamWriter = New StreamWriter(LOG)

                ' WRITE LOG FILE HEADERS INTO NEW LOG: 
                swMergeLog.WriteLine(vbCrLf & _
                                     "=====================================" & vbCrLf & _
                                     "WORK ORDER:  " & WORK_ORDER & vbCrLf & _
                                     "DEVICE NO:   " & DEVICE & vbCrLf & _
                                     "=====================================" & vbCrLf)

            End Using

PATH and WORK_ORDER are declared as Public earlier on as are PATH, LOG, TMP and CSV, this sub is also Public. I also need to use the log writer in other subs as well as WORK_ORDER and DEVICE. Using Static doesn't work, so I'm a bit stumped. Can anyone assist?

[fj1200]

I've found a solution but not sure if it's the solution. I'm splitting out PATH & WORK_ORDER & "_" & DEVICE to a separate variable called TARGET then passing that as an argument to the other subs and that seems to work ok, then using a new streamwriter to append to TARGET & ".log" and so on....

Is this ok or is there a better way?