Public Function ReplaceStorage( _
   ByVal newStorage As IDictionary(Of TKey,TValue) _
) As IDictionary(Of TKey,TValue)

public IDictionary<TKey,TValue> ReplaceStorage( 
   IDictionary<TKey,TValue> newStorage
)

SynchronizedDictionary<string, string> test = new SynchronizedDictionary<string, string>(StringComparer.Ordinal, new IgnoreLocking());
test["a"] = "b";
Assert.AreEqual(1, test.Count);
test.ReplaceStorage(new Dictionary<string, string>());
Assert.AreEqual(0, test.Count);

Dim test As New SynchronizedDictionary(Of String, String)(StringComparer.Ordinal, New IgnoreLocking())
test("a") = "b"
Assert.AreEqual(1, test.Count)
test.ReplaceStorage(New Dictionary(Of String, String)())
Assert.AreEqual(0, test.Count)