using System;

//Constructor & Overloading

public class User

{

    public static int NoNameUsers = 0;

    public string Name { get; set; }

​

    // Default Constructor

    public User()

    {

        Name = String.Format("User{0}", ++NoNameUsers);

        Console.WriteLine("Hello {0}", Name);

    }

​

    //The second Constructor

    public User(string name)

    {

        Console.WriteLine("Hello {0}", name);

        Name = name;

    }

}

​

public class Program

{

    public static void Main()

    {

        //Create a user

        User a = new User();

​

        //Create a named user

        User b = new User("John");

​

        //Create another user

        User c = new User();

    }

}