What is the difference between the keywords const and readonly in C#?

Constant

Constant fields are fields that cannot be modified. It needs to be assigned a value when declaring.

const int a = 5;

Readonly

Read-only fields are initialized when declared, or you can set it in the constructor.

Let's see an example where read only fields are only initialized inside the constructor -

Example

class Calculate {
   readonly int z;
   public Demo( ) {
      z = 20;
   }
}

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