Keith Brown wrote one of the most important books on Windows Security for Developers, “ProgrammingWindows Security”. In my opnion, Keith (formerly with Developmentor, and now a partner in Pluralsight, has written another security book “A .net developer's guide to Windows security”.
In the meantime you can read the entire book on line by clicking here.
HUGE Kudos to Keith and Addison Wesley for publishing this ON-LINE. (Please support this decision by purchasing the hard copy.)
Read this book - it's awesome.