সি# ContainsKey

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

    Dictionary<string, string> user = new() {
      {"নাম", "মোঃ আরিফ"},
      {"দেশ", "বাংলাদেশ"}
    };

    bool result = user.ContainsKey("নাম");

    Console.WriteLine(result);

    }
  }
}