using System;

using MongoDB.Driver;

using MongoDB.Bson;

using MongoDB.Bson.Serialization.Attributes;

using MongoDB.Driver.Builders;

​

public class Program

{

    [BsonIgnoreExtraElements]

    public class Booking

    {

        [BsonId]

        public ObjectId Id { get; set; }

        public string bookingId { get; set; }

​

        public Booking()

        {

        }

​

        public Booking(ObjectId id, string bookingId)

        {

            this.Id = id;

            this.bookingId = bookingId;

        }

    }

    public static void Main()

    {   

        var settings = MongoClientSettings.FromConnectionString("mongodb+srv://phh2:9W39I6XohphXKqi4@cluster0.au4os.mongodb.net/COVIDPassDB");

        MongoClient client = new MongoClient(settings);

        var database = client.GetDatabase("COVIDPassDB");

        var collection = database.GetCollection<Booking>("booking");

        var record = collection.Find(booking => booking.bookingId == "9202108191111111").ToList();

        Console.WriteLine(record.ToJson()); }

}