O'Reilly logo
  • 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

Cover of C# 5.0 in a Nutshell, 5th Edition

Note

http://stackoverflow.com/questions/55984/what-is-the-difference-between-const-and-readonly