public static string RunCommand(string conn, string command)
        {
            //List<BsonDocument> results = new List<BsonDocument>();
            BsonValue bv = new BsonValue();
            string retval_bvv = string.Empty; // bv.ToString();
            try
            {
                using (var db = new LiteDatabase(conn))
                {
                    Console.WriteLine( bv.ToString());
                    //BsonValue bv = db.RunCommand("db.customer.insert { Name: \"John Doe\" }");
                    //BsonValue bv = db.RunCommand("db.f**k.find  glossary.GlossDiv.GlossList.GlossEntry.ID like \"SGML\"");
                    //BsonValue bv = db.RunCommand(@"db.f**k.bulk C:\FxM\Dev\vs12\LiteDB\LiteDB-master\LiteDB.Shell\bin\Debug\test.dmp");
                    //BsonValue bv = db.RunCommand(@"db.f**k.bulk ..\..\..\..\test.dmp");

                    bv = db.RunCommand(command);

                    //JObject json22 = bv.// JObject.Parse(bv.ToString);

                    retval_bvv = bv.ToString();
                    //var json = LiteDB.JsonSerializer.Serialize(bv);
                    //Console.WriteLine(json.ToString());
                }
            }
            catch (Exception ex)
            {
                Console.WriteLine("wtf: " + ex.Message);
                retval_bvv = ex.Message;
            }

            return retval_bvv;
        }