using MongoDB.Bson;
using MongoDB.Driver;

string host = "localhost";
string port = "27017";
string user = "root";
string pass = "titok";

string uri = $"mongodb://{user}:{pass}@{host}:{port}";

try {
    var client = new MongoClient(uri);
    var collection = client.GetDatabase("zoldzrt").GetCollection<BsonDocument>("employees");

    var filter = Builders<BsonDocument>.Filter.Eq("name", "Nagy Jenő");
    var document = collection.Find(filter).First();
    Console.WriteLine(document);

    Console.WriteLine("Ok");    
} catch (MongoException e) {
    Console.Error.WriteLine("Hiba! A kapcsolódás sikertelen!");
    Console.Error.WriteLine(e.Message);
}