C#连接数据库遇到以下问题：哪位大佬会？

  代码见下：
 string MyConnectionString = "Server=127.0.0.1;Database=testdb;Uid=root;Pwd=123456;";

        private void btnSub_Click() {
            MySqlConnection connection = new MySqlConnection(MyConnectionString);
            MySqlCommand cmd;

            try{
                connection.Open();
                cmd = connection.CreateCommand();
                cmd.CommandText = "INSERT INTO book(id, name, number)values(1,'ltt', 15829348754)";
                cmd.ExecuteNonQuery();
            }catch (Exception) {
                throw;
            }
        }