Top books on r/csharp

Robert C. Martin

C# in Depth, 3rd Edition

CLR via C# (4th Edition) (Developer Reference)

Jeffrey Richter

Jennifer Greene, Andrew Stellman

C# 5.0 in a Nutshell: The Definitive Reference

Joseph Albahari, Ben Albahari

Steve McConnell

C# 6.0 in a Nutshell: The Definitive Reference

Joseph Albahari, Ben Albahari

The Art of Unit Testing: with examples in C#

Essential C# 6.0

Mark Michaelis, Eric Lippert

C# 6.0 and the .NET 4.6 Framework

Andrew Troelsen, Philip Japikse

Framework Design Guidelines

Krzysztof Cwalina, Brad Abrams

Microsoft Visual C# 2013 Step by Step

Agile Principles, Patterns, and Practices in C#

Robert C. Martin, Micah Martin

The C# Player's Guide (2nd Edition)

Dependency Injection in .NET

Pro ASP.NET MVC 5 (Expert's Voice in ASP.Net)

The Pragmatic Programmer

Andrew Hunt, David Thomas

Adaptive Code via C#

Gary McLean Hall

Concurrency in C# Cookbook

Pro C# 5.0 and the .NET 4.5 Framework

Andrew Troelsen

Microsoft Visual C# Step by Step

The C# Programming Language

Anders Hejlsberg

Programming C# 5.0

Programming WPF

Chris Sells, Ian Griffiths

The C# Player's Guide

Andrew Stellman, Jennifer Greene

Professional ASP.NET MVC 5

Concurrent Programming on Windows

Design Patterns