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Platforms
Windows, Linux
Desktop programming
C++, STL

WinAPI, MFC, GDI/GDI+, COM, ATL, WTL, ActiveX

.NET (1.1, 2.0, 3.5, 4.0), C#, managed C++, Windows.Forms, WPF, WCF

QT

XML, XSLT

Web programming
ASP.NET (1.1, 2.0, 3.5, 4.0), MVC, HTML, JavaScript, AJAX, Silverlight

Databases
ADO.NET, LINQ, Entity Framework

MS SQL (2000, 2005, 2008), MS Access, SQLite, MySQL