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There are a few C# ebooks available online – here is a list of some of them
- C# Essentials – C# Essentials contains 28 chapters of detailed information intended to provide everything necessary to gain proficiency as a C# programmer.
- C# Notes for Professionals – A variety of notes Compiled from StackOverflow documentation (PDF)
- C# Programming – from Wikibooks
- C# Programming Yellow Book – Rob Miles (PDF) (2019)
- C# Smorgasbord – Filip Ekberg (HTML) (PDF, EPUB, MOBI) (2018)
- C# Tips – 92 ebook with various c# tips by Jason Roberts (Leanpub account or valid email requested)
- Creating Mobile Apps with Xamarin.Forms C#
- Daily Design Patterns – Matthew P Jones (PDF)
- Data Structures and Algorithms with Object-Oriented Design Patterns in C# – Bruno Preiss
- Dissecting a C# Application – Christian Holm, Bernhard Spuida, Mike Kruger
- Fundamentals of Computer Programming with C# – multiple topics covered in this online tutorials by Svetlin Nakov, Veselin Kolev & Co (HTML, PDF)
- High level asynchronous programming with Reactive Extensions – Emil Petro
- Introduction to Rx
- Learn C# in Y Minutes is – a one pager with example code
- Mastering Xamarin UI Development, Second Edition – Steven F. Daniel (Packt account required)
- Object Oriented Programming using C# – Simon Kendal, Bookboon. (email address requested, not required)
- Threading in C#
- Xamarin.Forms for macOS Succinctly – Alessandro Del Sole
- Xamarin.Forms Succinctly – Alessandro Del Sole