using MongoDB.Driver;
using MongoDB.Driver.Linq;
using MongoDB.Bson;
using MongoDB.Bson.Serialization.Attributes;

namespace TestApp {

  class Program {

    static async Task Main(string[] args) {

      string connectionString = "<connection_string>";
      string databaseName = "entity";
      string collectionName = "entity-folders";
      var client = new MongoClient(connectionString);
      Console.WriteLine("connected");
      var db = client.GetDatabase(databaseName);
      var collection = db.GetCollection < FolderEntity > (collectionName);

      try {
        var query = collection.AsQueryable()
          .Where(x => x.Name.Equals("prefix" + x.Id.ToString()));        var res = await query.ToListAsync();
        Console.WriteLine($"Success: {res.Count}");
      } 
      catch (Exception ex) {
        Console.WriteLine($"Error: {ex.Message}");
      }
    }
  }  

public record FolderEntity {
    [BsonId, BsonRepresentation(BsonType.ObjectId)]
    public required string Id {get; set;}
    public required string Name {get; set;}
  }
}