What do you mean by 'ref' modifier in C# programming language?

Answer:

ref is a C# reference which is used to pass the reference types. It cannot pass the value types. This is mostly used in swapping implementations.
We have to declare it while writing a method and again need to use at calling point.

Example,

class MyClass

{

    static void Reverse(ref string first, ref string second)

    {

        string name = first;

        first = second;

        second = name;

    }

    static void Main()

    {

        string firstName = "Krishna";

        string lastName = "Vamshi";

        Reverse(ref firstName, ref lastName); // Calling method



        Console.WriteLine(firstName);         // Vamshi

        Console.WriteLine(lastName);          // Krishna

    }

}

In the above code, we have implemented a swap method and interchanging the first and last names using ref modifier.