সি# ফাংশন

using System;
namespace MyApplication {
  class Program {
    static void Main(string[] args) {

      static void Message() {
        Console.Write("হ্যালো বিশ্ব");
      }

      Message();

    }
  }
}

using System;
namespace MyApplication {
  class Program {
    static void Main(string[] args) {

      static void Message() {
        Console.Write("হ্যালো বিশ্ব");
      }

      Message();

    }
  }
}

using System;
namespace MyApplication {
  class Program {
    static void Main(string[] args) {

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

      Console.Write(Message());

    }
  }
}

using System;
namespace MyApplication {
  class Program {
    static void Main(string[] args) {

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

      Console.Write(Message());

    }
  }
}

using System;
namespace MyApplication {
  class Program {
    static void Main(string[] args) {

      Action message = () => {
        Console.Write("হ্যালো বিশ্ব");
      };

      message();

    }
  }
}

using System;
namespace MyApplication {
  class Program {
    static void Main(string[] args) {

  static string User(string name, string land) {
    return $"{name} - {land}";
  }

  Console.Write(User("আরিফ", "বাংলাদেশ"));

    }
  }
}

using System;
namespace MyApplication {
  class Program {
    static void Main(string[] args) {

  static void User(string name, string land) {
    Console.Write($"{name} - {land}");
  }

  User("আরিফ", "বাংলাদেশ");

    }
  }
}

using System;
namespace MyApplication {
  class Program {
    static void Main(string[] args) {

  static void User(string name, string land = "বাংলাদেশ") {
    Console.Write($"{name} - {land}");
  }

  User("আরিফ");

    }
  }
}

using System;
namespace MyApplication {
  class Program {
    static void Main(string[] args) {

  static void Reference(ref int number) {
    number = 123456;
  }

  int number = 100;

  Reference(ref number);

  Console.Write(number);

    }
  }
}

using System;
namespace MyApplication {
  class Program {
    static void Main(string[] args) {

  static void User(string name, string land) {
    Console.Write($"{name} - {land}");
  }

  User(name: "আরিফ", land: "বাংলাদেশ");

    }
  }
}

using System;
namespace MyApplication {
  class Program {
    static void Main(string[] args) {

  static void Counter(int number) {
    if(number <= 0) {
      return;
    }

    Console.WriteLine("নাম্বার " + number);

    Counter(number - 1);
  }

  Counter(10);

    }
  }
}

using System;
namespace MyApplication {
  class Program {
    static void Main(string[] args) {

  static string Outer() {

    string Inner() {
      return "হ্যালো বিশ্ব";
    }

    return Inner();
  }

  Console.Write(
    Outer()
  );

    }
  }
}

using System;
namespace MyApplication {
  class Program {
    static void Main(string[] args) {

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

  Func<string> function = Message;

  Console.Write(function());

    }
  }
}

using System;
namespace MyApplication {
  class Program {
    static void Main(string[] args) {

  static (string name, string land) User() {
    return ("আরিফ", "বাংলাদেশ");
  }

  var (name, land) = User();

  Console.Write($"{name} - {land}");

    }
  }
}