Public Function WithDisposeOf( _
   ByVal disposable As IDisposable _
) As DisposingStream

public DisposingStream WithDisposeOf( 
   IDisposable disposable
)

DisposableFlag f1 = new DisposableFlag();
DisposableFlag f2 = new DisposableFlag();
Assert.IsFalse(f1.Disposed || f2.Disposed);

Stream ms1 = new DisposingStream(new MemoryStream(Encoding.ASCII.GetBytes("Hello"))).WithDisposeOf(f1);
Stream ms2 = new DisposingStream(new MemoryStream(Encoding.ASCII.GetBytes("There"))).WithDisposeOf(f2);

using (Stream cs = new CombinedStream(ms1, ms2))
{ }

Assert.IsTrue(f1.Disposed && f2.Disposed);//even though not read, we did dispose?

Dim f1 As New DisposableFlag()
Dim f2 As New DisposableFlag()
Assert.IsFalse(f1.Disposed OrElse f2.Disposed)

Dim ms1 As Stream = New DisposingStream(New MemoryStream(Encoding.ASCII.GetBytes("Hello"))).WithDisposeOf(f1)
Dim ms2 As Stream = New DisposingStream(New MemoryStream(Encoding.ASCII.GetBytes("There"))).WithDisposeOf(f2)

Using cs As Stream = New CombinedStream(ms1, ms2)
End Using

Assert.IsTrue(f1.Disposed AndAlso f2.Disposed)
'even though not read, we did dispose?