Learn to use ITextServices to draw RTF text. This includes a short introduction to the windowless RichEdit as well.
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With the addition of the C/C++ extension to Visual Studio Code, you might have what is needed in a small, cross-platform editor.
Familiarize yourself with the Bing Search APIs and their use in the .NET universe.
It's easy to create a Temp file cleaner. Learn how here, with both C# and VB.NET versions.
Onion Architecture addresses the challenges faced with 3-tier and n-tier architectures, and provides a solution for common problems.