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Mono 2.0 has been released. Mono is a portable, open source .NET CLI implementation.
This release includes: various performance improvements, reduced runtime memory usage, a --debug=casts command line option for improved reporting of InvalidCastException message details, complete C# 3.0 support, improved anonymous method/lambda support, performance counters, support for native methods in assemblies on Windows, support for 64-bit indexed arrays on 64-bit systems, DTrace support on Mac OS X and Solaris, ADO.NET and ASP.NET improvements, and other changes.
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