Deep Clone function for .Net 2.0

This is an update to some code I originally found in CodeBox for .Net. The purpose of the function is to fully clone a given object. The object passed does need to be serialisable. If it is not the function returns Null.

Imports System.IO
Imports System.Runtime.Serialization.Formatters.Binary

Public Shared Function DeepClone(Of T )(ByVal source As T) As T
     If Not source.GetType().IsSerializable Then
         Return Nothing
     End If

     Dim target As T = Nothing
     Using ms As New MemoryStream()
         Dim bf As New BinaryFormatter()
         bf.Serialize(ms, source)
         ms.Position = 0
         target = bf.Deserialize(ms)
     End Using
     Return target
 End Function