确认服务凭据已更改

我正在使用以下代码更改windows服务的凭据。在显示凭据已成功更改的消息之前,我要确认已应用新凭据。我该怎么做?

using (ManagementObject service = new ManagementObject(new ManagementPath(objPath)))
                {
                    object[] wmiParams = new object[11];
                    wmiParams[6] = _username;
                    wmiParams[7] = _password;
                    service.InvokeMethod("Change", wmiParams);
                    Thread.Sleep(2000);
                    //check if new credentials in order
                    //Console.WriteLine("Service credentials changed");
                }