VB6 Datatype to VB.Net AKA:How to use System.Runtime.InteropServices.MarshalAs

I have this VB6 Datatype that I need to convert to VB.NET I have no clue how to handle the arrays...  Little help??

Type BVInventoryRecord
    InvWhse                            As String * 6
    InvPartCode                        As String * 34
    InvDescription                     As String * 80
    InvProductCode                     As String * 10
    InvLocation                        As String * 20
    InvOnHoldFlag                      As String * 1
    InvCurrentCost                     As String * 17          'Mask ±##########.#####
    InvAverageCost                     As String * 17          'Mask ±##########.#####
    InvSellingPrice(1 To 20)           As String * 17          'Mask ±##########.#####
    InvPromoStartDate                  As String * 8
    InvPromoEndDate                    As String * 8
    InvPromoFlag                       As String * 1
    InvPromoMandatoryFlag              As String * 1
    InvPromoSellingPrice               As String * 17          'Mask ±##########.#####
    InvQuantityBreak(1 To 9)          As BVQuantityBreaks
    InvTaxFlag(1 To 4)                 As String * 1
    InvMeasure                         As String * 10
    InvCurrentPONo                     As String * 10
    InvPODueDate                       As String * 8
    InvMinBuyQty                       As String * 11
    InvDiscountableFlag                As String * 1
    InvSerializedFlag                  As String * 1
    InvSalesAccount                    As String * 4
    InvOnHandQty                       As String * 17          'Mask ±##########.#####
    InvReorderPointQty                 As String * 17          'Mask ±##########.#####
    InvCommittedQty                    As String * 17          'Mask ±##########.#####
    InvBackOrderQty                    As String * 17          'Mask ±##########.#####
    InvOnOrderQty                      As String * 17          'Mask ±##########.#####
    InvAltPartWarehouse                As String * 6
    InvAltPartCode                     As String * 34
    InvMisc1                           As String * 30
    InvMisc2                           As String * 17          'Mask ±##########.#####
    InvSalesByPeriod                   As BVSalesByPeriod
    InvType                            As String * 1
    InvImageFileName                   As String * 261
    InvWeight                          As String * 13          'Mask ±######.#####
    InvECommerceFlag                   As String * 1
    InvUPCCode                         As String * 40
    InvPreferredVendor                 As String * 20
    InvXtdDesc                         As String * 5000
    InvUomDesc                         As String * 80
    InvAllowBackOrders                 As String * 1
    InvAllowReturns                    As String * 1
End Type

So far I have:
Structure BVInventoryRecord
            <VBFixedString(6), System.Runtime.InteropServices.MarshalAs(System.Runtime.InteropServices.UnmanagedType.ByValArray, SizeConst:=6)> Private sInvWhse As Char()
            <VBFixedString(34), System.Runtime.InteropServices.MarshalAs(System.Runtime.InteropServices.UnmanagedType.ByValArray, SizeConst:=34)> Private sInvPartCode As Char()
            <VBFixedString(80), System.Runtime.InteropServices.MarshalAs(System.Runtime.InteropServices.UnmanagedType.ByValArray, SizeConst:=80)> Private sInvDescription As Char()
            <VBFixedString(10), System.Runtime.InteropServices.MarshalAs(System.Runtime.InteropServices.UnmanagedType.ByValArray, SizeConst:=10)> Private sInvProductCode As Char()
            <VBFixedString(20), System.Runtime.InteropServices.MarshalAs(System.Runtime.InteropServices.UnmanagedType.ByValArray, SizeConst:=20)> Private sInvLocation As Char()
            <VBFixedString(1), System.Runtime.InteropServices.MarshalAs(System.Runtime.InteropServices.UnmanagedType.ByValArray, SizeConst:=1)> Private sInvOnHoldFlag As Char()
            <VBFixedString(17), System.Runtime.InteropServices.MarshalAs(System.Runtime.InteropServices.UnmanagedType.ByValArray, SizeConst:=17)> Private sInvCurrentCost As Char()
            <VBFixedString(17), System.Runtime.InteropServices.MarshalAs(System.Runtime.InteropServices.UnmanagedType.ByValArray, SizeConst:=17)> Private sInvAverageCost As Char()


But then I hit the arrays and Im not sure how to represent them