static public void testcommand()
{
string connectionStr = "mongodb://localhost:27017";
MongoClient _client = new MongoClient(connectionStr);
MongoDatabaseBase _database = _client.GetDatabase("music") as MongoDatabaseBase;
IMongoCollection <BsonDocument> collection = _database.GetCollection <BsonDocument>("namespaces");
var s = _database.ListCollections().ToList().Count;
//var value= collection.Find(new BsonDocument("", "")).First();
//int num = _database.RunCommand(new JsonCommand<int>("{db:'stats'}"));
}