MongoDB C＃驱动程序查询始终返回null

Question

I'm trying to make a simple query to mongoDB using C# Driver. I've been trying a lot of things and then I came to this but it Always returns null.
Does anyone know if what could it be?

IMongoCollection<BsonDocument> users = Utilities.getCicCollection("Users");
            var builder = Builders<BsonDocument>.Filter;
            var filter= builder.Eq("Username", "test@test.it") & builder.Eq("Password", "testing");
            var result = users.Find(filter).FirstOrDefault();
            return (result!=null?true:false);

Answer 1

Use the standard snippet

var collection = _database.GetCollection<BsonDocument>("Users");
var builder = Builders<BsonDocument>.Filter;
var filter = builder.Eq("Username", "test@test.it") & builder.Eq("Password", "testing");
var list = await collection.Find(filter).ToListAsync()
var result = list.FirstOrDefault();