No validity checks are performed on the MSIL stream.
Calling this method a second time replaces the first MSIL stream with the second.
Generating your own metadata and MSIL requires familiarity with the Common Language Infrastructure (CLI) documentation, especially "Partition II: Metadata Definition and Semantics" and "Partition III: CIL Instruction Set." The documentation is available online; see tp://go.microsoft.com/fwlink/?LinkID=99212 on MSDN and tp://go.microsoft.com/fwlink/?LinkID=65552 on the Ecma International Web site.