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C#

readonly


The readonly keyword is a modifier that you can use on fields. When a field declaration includes a readonly modifier, assignments to the fields introduced by the declaration can only occur as part of the declaration or in a constructor in the same class. Note The readonly keyword is different from the const keyword. A const field can only be initialized at the declaration of the field. A readonly field can be initialized either at the declaration or in a constructor. Therefore, readonly fields can have different values depending on the constructor used. Also, while a const field is a compile-time constant, the readonly field can be used for runtime constants

Syntax:
public readonly int y = 5;


Example:

class Age
    {
        readonly int _year;
        Age(int year)
        {
            _year = year;
        }
        void ChangeYear()
        {
            //_year = 1967; // Compile error if uncommented.
        }
    }


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