//4b3 InsertMany row document
public string DocumentInsert_InsertMany(string name = "honda v1")
{
    // Replace the uri string with your MongoDB deployment's connection string.
    var client = new MongoClient(
        "mongodb://localhost:27017/?readPreference=primary&appname=MongoDB%20Compass&directConnection=true&ssl=false"
    );

    string re = "";

    //lấy database
    var database = client.GetDatabase("HvDadabase");
    //Lấy List Collection
    var collection = database.GetCollection<BsonDocument>("HvCars");

    //select lấy 1 row Document
    List<BsonDocument> documentList = new List<BsonDocument>();
    documentList.Add(new BsonDocument
    {
        { "name", "Benz v1" },
        { "year", 2005}
    });
    documentList.Add(new BsonDocument
    {
        { "name", "Benz v2" },
        { "year", 2006}
    });

    collection.InsertMany(documentList);
    //await collection.InsertOneAsync(document);

    re = "InsertMany complete";
    return re;
}