What is a Readonly Keyword?
The keyword Readonly has a value that can be altered or allocated at runtime, but only through the non-static constructor.
What is a Constant Keyword?
Constant fields and constant local are declared with the const keyword in C#. The constant field’s value remains constant throughout the programme. When it comes to C#, both locals and constant fields are not variables; a constant field is a string, number, boolean values, and null reference.
Difference between Constant and Readonly in C#
| S.No. | Readonly Keyword | Const Keyword |
| 1 | In C#, we can use the readonly keyword to create readonly fields. | In C#, we can use the const keyword to create constant fields. |
| 2 | It belongs to runtime. | It belongs to compile-time. |
| 3 | The readonly field’s value can be altered. | The const field’s value cannot be modified. |
| 4 | It is not possible to declare it inside the method. | It is possible to declare it inside the method. |
| 5 | In the case of readonly fields, we can allocate values in the construction part and declaration segment. | In the case of const fields, we can only allocate values in the declaration segment. |
| 6 | We can use it with static modifiers. | We cannot use it with static modifiers. |
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