The HDF5 .NET wrappers have been replace replaced by a complete set of Platform Invoke (P/Invoke) declarations for the core HDF5 C-API.
In 2007-2008, The HDF Group released its first set of HDF5 .NET wrappers, HDF5DotNet. The project was sponsored by Agilent and Boeing. This version was tested with HDF5 1.8.9. HDF5DotNet, written in C++/CLI, wraps a subset of the HDF5 library API in a .NET assembly. Although unsupported and unmaintained it is available and frozen at the November 2012 level. People are strongly encouraged to use the P/Invoke version in place of HDF5DotNet.