Public Class HelloCustomer
    Implements IHelloCustomer

    Public Function HelloFirstName(ByVal cust As Customer) As String _
      Implements IHelloCustomer.HelloFirstName
        Return "Witaj, " & cust.FirstName
    End Function

    Public Function HelloFullName(ByVal cust As Customer) As String _
      Implements IHelloCustomer.HelloFullName
        Return "Witaj, " & cust.FirstName & " " & cust.LastName
    End Function
End Class
