Patrick R Gallagher thinks this is interesting: The readonly modifier prevents a field from being modified after construction. A read-only field can be assigned only in its declaration or within the enclosing type’s constructor. From 3. Creating Types in C# from C# 5.0 in a Nutshell, 5th Edition by Ben Albahari, Joseph Albahari Publisher: O'Reilly Media, Inc. Released: June 2012 Note http://stackoverflow.com/questions/55984/what-is-the-difference-between-const-and-readonly Share this highlight http://www.safaribooksonline.com/a/c-50-in/5835/ Twitter Facebook Google Plus Email Get Instant Access Now Start a Free Trial Have an account? Sign in. Minimise Unlock the rest of C# 5.0 in a Nutshell, 5th Edition and 30,000 other books and videos By clicking this box, you confirm that you have read and agree to the terms and conditions of our Membership Agreement, and you understand that when your trial period ends, you will be required to provide billing information if you wish to continue using the service. Unlock the rest of this book Start a Free 10-Day Trial loading Learn about Safari for Business Have an account? Sign in.