সি# pair

using System;
using System.Collections.Generic;

class Program {
  static void Main() {
    Dictionary<string, string> user = new Dictionary<string, string>();

    user[""] = "মোঃ আরিফ";
    user[""] = "";

    Console.WriteLine(user["নাম"]);
    Console.Write(user["দেশ"]);
  }
}