Public Class OrderedEnumeration(Of T) 

public class OrderedEnumeration<T> 

var order = new OrderedEnumeration<byte>(new byte[1]);
System.Collections.IEnumerator e = ((System.Collections.IEnumerable)order).GetEnumerator();
Assert.IsTrue(e.MoveNext());
Assert.IsFalse(e.MoveNext());
try
{
    object val = e.Current;
    GC.KeepAlive(val);
    Assert.Fail();
}
catch (InvalidOperationException) { }

try
{
    e.Reset();
    Assert.Fail();
}
catch (NotSupportedException) { }

Dim order As var = New OrderedEnumeration(Of Byte)(New Byte(1) {})
Dim e As System.Collections.IEnumerator = (DirectCast(order, System.Collections.IEnumerable)).GetEnumerator()
Assert.IsTrue(e.MoveNext())
Assert.IsFalse(e.MoveNext())
Try
    Dim val As Object = e.Current
    GC.KeepAlive(val)
    Assert.Fail()
Catch generatedExceptionName As InvalidOperationException
End Try

Try
    e.Reset()
    Assert.Fail()
Catch generatedExceptionName As NotSupportedException
End Try