causes all new .NET objects returned to Mathematica during the evaluation of expr to be released when expr finishes.
- To use NETBlock, you first need to load .NET/Link using Needs["NETLink`"].
- It is an error to refer to a released object.
- NETBlock only affects new objects, not additional references to ones that have previously been seen.
- NETBlock is a way to mark a set of objects as temporary so they can be automatically cleaned up on both the Mathematica and .NET sides.