A set of free, open source tools for mounting open standards-based
geospatial data servers is now available as a .Net SDK (see
http://www.thecarbonproject.com/products/carbon.html ).

Missing from this suite is the Z39.50 search service. Z39.50
is required for servers to participate in the various Spatial
Data Infrastructures (now grown to about 50 nations worldwide,
with almost 400 metadata servers searchable through the GSDI
Clearinghouse.)

If you have or know of .Net components that could provide Z39.50
server and client functions to this SDK, please let me know!

Eliot

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CarbonTools
Geospatial .NET development toolkit

The mission of CarbonTools(TM) is to make open geospatial services
accessible to Windows developers. The CarbonTools SDK provides an
open and extendable framework on which Windows and .NET developers
can build software solutions.

The CarbonTools toolkit provides an extensive API that supports
  the Open Geospatial Consortium (OGC) specifications including
Web Map Services (WMS), Web Feature Services (WFS) and Geography
Markup Language (GML). These extensive and robust specifications
are a major challenge for developers. The CarbonTools API makes
these specifications accessible to developers. Beginners as well
as the most advanced developers should find that supporting
geospatial solutions is a manageable task with CarbonTools.

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