Answer Posted / akshay

Constants :

* Constant value. Cannot be changed once initialized.
Should be Initialize the value where it declared.
* Const value fully evaluated at compile time
* By default static
* Possible to declare within function

Readonly :

* Could be declare as Static or Non Static
* Assign the value where it declared or can be assigned in
constructor
* Could not declare within function
* can be initialized in compile time or in runtime.

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