How to enable tarpitting on your SMTP server for specific commands? This article describes how you can customize tarpitting using the AsyncCallback functionality provided by the sink interface.

Post about the online Marshalling Compiler. It takes a C style header and converts it into an import of a native DLL in managed C# code.

This article describes the issues (and solutions) around parallel programming with sockets and goes deeper into the difference between Concurrent vs Parallel, Threads vs Tasks and Imperative vs Functional. Example source code included.

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Checking passwords the secure way. This post explains how you can implement a secure password system. A system where you don't have to send your password over the internet to be validated. It explains about HMAC and Cram-MD5. Some examples (in C#.Net) are included to demonstrate implementation of the system.