C#

    ServiceInfo service = (ServiceInfo)serviceInfo;

    ManagementOperationObserver observer = new ManagementOperationObserver();
    MyHandler completionHandlerObj = new MyHandler();
    observer.ObjectReady += new ObjectReadyEventHandler(completionHandlerObj.Done);

    try
    {
        ConnectionOptions conn = new ConnectionOptions();
        conn.Impersonation = ImpersonationLevel.Impersonate;
        conn.Username = "DOMAIN\username";
        conn.Password = "password";
        conn.EnablePrivileges = true;

        ManagementScope scope = new ManagementScope("\\\\" + service.DNSHost + "\\root\\CIMV2", conn);
        scope.Connect();

        ManagementObjectSearcher mos = new ManagementObjectSearcher(scope, new ObjectQuery("SELECT * FROM Win32_Service WHERE DisplayName='" + service.item.Text + "'"));
        foreach (ManagementObject mo in mos.Get())
        {
            bool Started = Convert.ToBoolean(service.item.SubItems[1].Text);
            if (Started)
                mo.InvokeMethod(observer, "StopService", null);
            else if (!Started)
                mo.InvokeMethod(observer, "StartService", null);

            int intCount = 0;
            while
            (!completionHandlerObj.IsComplete)
            {
                if (intCount > 10)
                {
                    MessageBox.Show("Terminate process timed out.", "Terminate Process Status");
                    break;
                }
                System.Threading.Thread.Sleep(500);
                intCount++;
            }

            //see if call was successful.
            if (completionHandlerObj.ReturnObject.Properties["returnValue"].Value.ToString() == "0")
            {
                if (!Started)
                {
                    service.item.SubItems[1].Text = "True";
                    service.item.SubItems[1].BackColor = Color.LimeGreen;
                    service.item.SubItems[1].ForeColor = Color.Black;
                }
                else
                {
                    service.item.SubItems[1].Text = "False";
                    service.item.SubItems[1].BackColor = Color.Red;
                    service.item.SubItems[1].ForeColor = Color.White;
                }
            }
            else
            {
                MessageBox.Show("Failed.", "Start/Stop Service Failure");
            }

        }
    }
    catch (Exception ex) { MessageBox.Show("Error starting/stoppping service.\n\n" + ex.Message); }
    finally
    {
        Invoke((Action)(() => { picProgressServices.Visible = false; }));
    }
}