Public Function Contains( _
   ByVal item As Integer _
) As Boolean

public bool Contains( 
   int item
)

OrdinalList lista = new OrdinalList(new int[] { 1, 4, 5 });
OrdinalList listb = new OrdinalList(new int[] { 2, 4, 6 });

OrdinalList union = lista.UnionWith(listb);
Assert.AreEqual(5, union.Count);
foreach (int i in union)
    Assert.IsTrue(lista.Contains(i) || listb.Contains(i));

OrdinalList inter = lista.IntersectWith(listb);
Assert.AreEqual(1, inter.Count);
foreach (int i in inter)
    Assert.AreEqual(4, i);

Dim lista As New OrdinalList(New Integer() {1, 4, 5})
Dim listb As New OrdinalList(New Integer() {2, 4, 6})

Dim union As OrdinalList = lista.UnionWith(listb)
Assert.AreEqual(5, union.Count)
For Each i As Integer In union
    Assert.IsTrue(lista.Contains(i) OrElse listb.Contains(i))
Next

Dim inter As OrdinalList = lista.IntersectWith(listb)
Assert.AreEqual(1, inter.Count)
For Each i As Integer In inter
    Assert.AreEqual(4, i)
Next