What is ref key word in C#?

Ravi Vishwakarma 885 11 Jun 2024

Ravi Vishwakarma

Software Developer

1 Answers

Ravi Vishwakarma 11 Jun 2024

The ref keyword is used to pass arguments to methods by reference, rather than by value. This means that any changes made to the parameter within the method will affect the original variable outside of the method.

Here's how it works:

using System;

class Program
{
    static void Main()
    {
        int num = 10;
        Console.WriteLine("Before calling the method: " + num);
        // Passing 'num' variable by reference
        ChangeNumber(ref num);
        Console.WriteLine("After calling the method: " + num);
    }

    static void ChangeNumber(ref int x)
    {
        x = 20; // Changes the value of 'num' in Main method
    }
}

Output:

Before calling the method: 10
After calling the method: 20

Without the ref keyword, changes made to the parameter x inside the ChangeNumber the method would not affect the original num variable.

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What is ref key word in C#?

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