[kroltan]

C# does not (as far as I know) have readonly or const for local variables, only to fields. You can even have consts inside method bodies, but they are only actual compile-time constants.

codeflo means to declare a local variable that cannot be reassigned later.

    void Foo() {
        // this is possible in C# today, but only for compile-time constants
        const int Bar = 42;

        // this is what codeflo wants: variables that cannot be changed after declaration, but can hold runtime values
        readonly string text = $"Blah: {Bar + System.Environment.ProcessorCount}";

        // with such a variable, you wouldn't be able to reassign it later:
        text = "Some other text";
        // the line above would be a compile-time error, just like trying to reassign to a readonly field.
    }