Final variables in C#

Java has the final keyword, but C# does not have its implementation. The same implementation is achieved in C# using seal or readonly keyword.

readonly allows a variable to be assigned a value only once. Fields marked "read-only" can only be set once during object construction. It cannot be changed.

Example

class Employee {
   readonly int age;

   Employee(int age) {
      this.age = age;
   }

   void ChangeAge() {
         //age = 27; // Compile error
   }
}

Above, we set the age field to read-only and cannot be changed once assigned.

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