freeCodeCamp/guide/english/csharp/method-overloading/index.md

title
Method Overloading

Method Overloading

Default parameters were introduced in C# version 4.0, but up until that, C# coders have been using a different technique, which basically does the same, called method overloading. It allows the programmer do define several methods with the same name, as long as they take a different set of parameters. When you use the classes of the .NET framework, you will soon realize that method overloading is used all over the place.

Example

1. Create a class file named Person.cs & input the following code.

public class Person
{
  public string FirstName { get; private set; }
  public string LastName { get; set; }

  public Person(string firstName, string lastName)
  {
      this.FirstName = firstName;
      this.LastName = lastName;
  }

  public string SayHello(string name)
  {
      return "Hello there, " + name;
  }

  public string SayHello(Person person)
  {
      return "Hello there, " + person.FirstName + " " + person.LastName;
  }
}

2. In your default Program.cs file you can call now this class Person using the method overloading.

class Program
    {
        static void Main(string[] args)
        {
            Person person = new Person("Jane", "Doe");
            Console.WriteLine(person.SayHello("Peter Smith"));

            Person friend = new Person("Chuck", "Norris");
            Console.WriteLine(person.SayHello(friend));

            Console.ReadKey();


        }
    }