Const Readonly in

About Const Readonly

By default, values in C# are mutable, that is they can change over time. To make a value immutable, there are two options:

1. Add the const modifier.
2. Add the readonly modifier.

The const modifier has some restrictions:

1. It can only be applied to "constant" types: strings, booleans and numbers.
2. The const value must be initialized immediately.

See defining constants for more information.

If your value is a non-constant type or you need to initialize the value in a constructor, readonly can be used to enforce immutability.