Public Class Form1
 
    Public clscustomer() As clscustomer
 
    Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As _
      System.EventArgs) Handles MyBase.Load
        ReDim clscustomer(0) 'Erste erstellen
        clscustomer(0) = New clscustomer
        clscustomer(0).get_name = "Müller"
        clscustomer(0).get_Vorname = "Hans"
 
        ReDim Preserve clscustomer(1) 'Weitere  erstellen
        clscustomer(1) = New clscustomer
        clscustomer(1).get_name = "Schulze"
        clscustomer(1).get_Vorname = "Gert"
 
 
        MessageBox.Show("Name: " + clscustomer(0).get_name + "; Vorname: " + _
          clscustomer(0).get_Vorname)
        MessageBox.Show("Name: " + clscustomer(1).get_name + "; Vorname: " + _
        clscustomer(1).get_Vorname)
 
        End
    End Sub
End Class
 
Public Class clscustomer
 
    Public NameValue As String
    Public VornameValue As String
 
    Public Property get_name() As String
        Get
            Return NameValue
        End Get
        Set(ByVal value As String)
            NameValue = value
        End Set
    End Property
 
    Public Property get_Vorname() As String
        Get
            Return VornameValue
        End Get
        Set(ByVal value As String)
            VornameValue = value
        End Set
    End Property
 
End Class

    Public Class Person
 
        'Properties mit Defaultwerten z.B. um Nothing zu vermeiden
        Public Property Name As String = ""
        Public Property Vorname As String = ""
        Public Property GebDat As Date = DateTime.MinValue
 
        Public Sub New()
            'parameterfreier Konstruktor für Default-Instanz
        End Sub
 
        Public Sub New(ByVal name As String, ByVal vorname As String, ByVal _
          gebdat As Date)
            Me.Name = name
            Me.Vorname = vorname
            Me.GebDat = gebdat
        End Sub
    End Class
 
 
    'Sortierkriterien-Aufzählung
    Public Enum PersonCompareEnum As Integer
        Name
        Vorname
        Geburtsdatum
    End Enum
 
 
    'Parametrisierter Comparer zum (hierarchischen) Vergleichen und Sortieren 
    ' von Personen
    Public Class PersonComparer
        Implements IComparer(Of Person)
 
        Public Property CompareProperty As PersonCompareEnum = _
          PersonCompareEnum.Name
        Public Property CompareOrder As Windows.Forms.SortOrder
 
        Public Function Compare(x As Person, y As Person) As Integer 
            Implements IComparer(Of Person).Compare
 
            Dim c_name, c_vorname, c_geb, c As Integer
 
            'Klassen-Properties einzeln vergleichen
            c_name = x.Name.CompareTo(y.Name)
            c_vorname = x.Vorname.CompareTo(y.Vorname)
            c_geb = x.GebDat.CompareTo(y.GebDat)
 
            'Hierarchischer Vergleich nach CompareProperty
            Select Case CompareProperty
                Case PersonCompareEnum.Name
                    c = getSortOrder(c_name, c_vorname, c_geb)
                Case PersonCompareEnum.Vorname
                    c = getSortOrder(c_vorname, c_name, c_geb)
                Case PersonCompareEnum.Geburtsdatum
                    c = getSortOrder(c_geb, c_name, c_vorname)
                Case Else
                    Throw New NotImplementedException()
            End Select
 
            'Vergleichsrichtung einbeziehen
            If CompareOrder = SortOrder.Descending Then
                c *= -1
            End If
 
            'Vergleichsergebnis
            Return c
        End Function
 
 
        Private Function getSortOrder(a As Integer, b As Integer, c As Integer) _
          As Integer
            'Aus Einzelvergleichen den Gesamtvergleich erstellen
            Dim r As Integer = a
            If r = 0 Then r = b
            If r = 0 Then r = c
            Return r
        End Function
    End Class
 
 
    'Beispiel:
 
    'Eine Zugriffsvariable auf eine Liste von Personen 
    Dim Personen As List(Of Person)
 
    Private Sub Demo()
 
        'Eine Liste erstellen und füllen (Nutzung der Defaultinstanz bei NEW)
        Personen = New List(Of Person)
 
        Personen.Add(New Person With
                     {.Name = "Müller", .Vorname = "Hans",
                     .GebDat = New DateTime(2010, 5, 18)})
 
        Personen.Add(New Person With
                     {.Name = "Schulze", .Vorname = "Gert",
                     .GebDat = New DateTime(1995, 12, 24)})
 
        Personen.Add(New Person With
                     {.Name = "Adam", .Vorname = "Hans",
                     .GebDat = New DateTime(1995, 11, 2)})
 
        Personen.Add(New Person With
                     {.Name = "Adam", .Vorname = "Hans",
                     .GebDat = New DateTime(1995, 11, 4)})
 
        'Die Liste fallend sortieren nach Vorname (incl. Name/Geburt) 
        Personen.Sort(New PersonComparer With
                      {.CompareProperty = PersonCompareEnum.Vorname,
                      .CompareOrder = SortOrder.Descending})
 
        For i As Integer = 0 To Personen.Count - 1
            With Personen(i)
                System.Diagnostics.Debug.WriteLine
                 (.Name & " " & .Vorname & " " & .GebDat.ToString)
            End With
        Next i
    End Sub