VB.NET DataGrid Record Loop Help

[KA NMC]

Basically what I'm trying to do is - subtract a time field in my record from my system time for each record. Business Days Only
example

order NO__Name ___Req_date ___Days late (Dynamic Column for Calc Results)
11111_____ Test ___8/17/2007 ________4
11112_____ Test2 ___8/15/2007 _______6

Days Late is a dynamic column
I need to do this for each record - and I can not get my loop to work - when it loops it I only get the calculation for the first record and it puts that calculation in every record for days late

This is my Code - What am I missing? How do I get it to go to next record - I've changed the code around so much - that nothing makes sense any more - Help will be appreciated

Dim dt1 As New DataTable            
Dim rw As DataRow

            dt1 = MyDataSet.Tables(0)

            For Each rw In dt1.Rows
                '  Console.WriteLine(rw("Days Late"))
                Select Case DatePart("w", d1)
                    Case 1
                        subtract = subtract + 1
                    Case 7  
                        subtract = subtract + 2
                End Select

                Select Case DatePart("w", d2)
                    Case 1
                        subtract = subtract + 2
                    Case 7
                        subtract = subtract + 1
                End Select

                absday = DateDiff("d", d1, d2) + 1 - subtract

                fncGetDays = absday - CInt(2 * (absday \ 7))

                If fncGetDays < 0 Then fncGetDays = 0
                
            Next rw