c# const vs readonly
readonly keyword is used to define a variable
which can be assigned once after the declaration
either during declaration or in the constructor.
const keyword is used to define a constant to be used in the program.
A const is a compile-time constant whereas readonly allows a value to be calculated at run-time and set in the constructor or field initializer. So, a 'const' is always constant but 'readonly' is read-only once it is assigned.