file mask in .net

hi,
i wanted to filter specific files like *.mdb how do i write the syntax
session.SynchronizeDirectories(SynchronizationMode.Local, "C:\projects\holon", "/holon/test/", False, True, SynchronizationCriteria.Time, TransferOptions = ("*.mdb"))

Replace TransferOptions = ("*.mdb") with new TransferOptions { FileMask = "*.mdb" }