Where to place format functions

Question

I am building my first n-tier application.

• The first tier is a ASP.net website.
• The second is the business tier.
• The third is the data tier with dapper.

The second and third layer are used in different websites.

When i have a numeric field for the tax option. 1 = High BTW and 2=Low btw and 3 = No btw Is it a good design to make an translate function in the business Artikel class? If the answer is no, where is the correct place to translate values. I use this function in the view to show the text instead of the number.

Example:

Public Function ArtBtwShow() As String
    Return ArtikelHelper.GetBtwName(ArtBtw)
End Function

GetBtwName Helper function:

Shared Function GetBtwName(Btw As String)
    Select Case Btw
        Case "0"
            Return "Geen"
        Case "1"
            Return "Laag"
        Case "2"
            Return "Hoog"

        Case Else
            Return ""
    End Select
End Function

Answer 1

I'm not sure exactly what you're trying to do, but it looks like you need to use an Enum rather than a string for your Btw object:

Public Enum Btw
    Green = 0
    Laag = 1
    Hoog = 2
End Enum

I think the business layer is the place to put this.

You then retrieve the decription like so:

Public Funtion GetName(btw As Btw)
    return [Enum].GetName(GetType(Btw), (int)btw)
End Function