[VB 2010] Distruggere un'istanza di una classe

Public Class Prova

    Protected _METODO1 As Integer
    Protected _METODO2 As Integer

     Public Sub New()
          'code...
     End Sub

     Public Overridable Property Metodo1() As Integer
          Get
               Return _METODO1
          End Get
          Set (value As Integer)
               _METODO1 = value
          End Set
     End Property

     Public Overridable Property Metodo2() As Integer
          Get
               Return _METODO2
          End Get
          Set (value As Integer)
               _METODO2 = value
          End Set
     End Property

End Class

Public Class ProvaIstanza

     Dim IProva As Prova

     Public Sub Istanzia()
          For i As Integer = 0 To 5
               IProva = New Prova()
          Next
     End Sub

End Class

List<Prova> listaGrande = new List<Prova)();

for (int i = 0; i < 5; i++)
{
Prova dummyIstanza = new Prova();
dummyIstanza._METHOD1 = 5;
dummyIstanza._METHOD2 = 15;
listaGrande.Add(dummyIstanza);
}

listaGrance.RemoveAt(1);

 listaGrande.Remove(
dummyVar).

listaGrande[3] = new Prova();