Optional Parameters

Optional Parameters

A parameter becomes optional by giving it a default value in the method declaration, letting callers omit it entirely. Optional parameters must come after all required parameters. Named arguments let you skip earlier optional parameters and set a later one directly.

Warning: Optional parameter defaults are baked in at the call site's compile time, not the method's — be careful if you change a default later without recompiling callers.

Example: Optional Parameters

using System;

class Program
{
    static void Greet(string name, string greeting = "Hello")
    {
        Console.WriteLine($"{greeting}, {name}!");
    }

    static void Main(string[] args)
    {
        Greet("Priya");
        Greet("Priya", "Welcome");
        Greet(name: "Lee", greeting: "Hi");
    }
}