সি# অবজেক্ট ওরিয়েন্টেড প্রোগ্রামিং

using System;

class User {
  public string name = "আরিফ";
  public string land = "বাংলাদেশ";
}

class Program {
  static void Main() {
    User user = new User();

    Console.WriteLine(user.name);
    Console.WriteLine(user.land);
  }
}

using System;

class User {
  public string name = "আরিফ";
  public string land = "বাংলাদেশ";
}

class Program {
  static void Main() {
    User user = new User();

    Console.WriteLine(user.name);
    Console.WriteLine(user.land);
  }
}

using System;

class Message {
  public string text = "হ্যালো বিশ্ব";
}

class Program {
  static void Main() {
    Message message = new Message();

    Console.Write(message.text);
  }
}

using System;

class Message {
  private string text = "হ্যালো বিশ্ব";

  public string Show() {
    return text;
  }
}

class Program {
  static void Main() {

    Message message = new Message();
    Console.Write(message.Show());
  }
}

using System;

class Message {
  protected string text = "হ্যালো বিশ্ব";

  public string Show() {
    return text;
  }
}

class Program {
  static void Main() {

    Message message = new Message();
    Console.Write(message.Show());
  }
}

using System;

class Message {
  public readonly string text;

  public Message(string text) {
    this.text = text;
  }
}

class Program {
  static void Main() {
    Message message = new Message("হ্যালো বিশ্ব");

    Console.Write(message.text);
  }
}

using System;

class CSHARP {
  public const string VERSION = "8.2.3";
}

class Program {
  static void Main() {
    Console.Write(CSHARP.VERSION);
  }
}

using System;

abstract class User {
  public string name;
  public string land;

  public User(string name, string land) {
    this.name = name;
    this.land = land;
  }
}

class Author : User {
  public Author(string name, string land)
    : base(name, land) {
  }
}

class Program {
  static void Main() {
    Author user = new Author("আরিফ", "বাংলাদেশ");

    Console.WriteLine(user.name);
    Console.WriteLine(user.land);
  }
}

using System;

interface User {
  void Info();
}

class Author : User {
  public void Info() {
    Console.Write("আরিফ - বাংলাদেশ");
  }
}

class Program {
  static void Main() {

    Author user = new Author();
    user.Info();
  }
}

using System;

class User {
  public static string name = "আরিফ";

  public static string Message() {
    return "হ্যালো বিশ্ব";
  }
}

class Program {
  static void Main() {
    Console.WriteLine(User.name);
    Console.Write(User.Message());
  }
}