see OpenService

To open service you don't need to use Windows API (OpenSCManager() and OpenService()) use field of System.ServiceProcess.ServiceController class (ServiceController.ServiceHandle.DangerousGetHandle())

        svcHandle = OpenService(scHandle, serviceName, (int)SERVICE_ACCESS.SERVICE_ALL_ACCESS);

To open service you don't need to use Windows API (OpenSCManager() and OpenService()) use field of System.ServiceProcess.ServiceController class (ServiceController.ServiceHandle.DangerousGetHandle())

        svcHandle = OpenService(scHandle, serviceName, (int)SERVICE_ACCESS.SERVICE_ALL_ACCESS);

IntPtr serv = Tools.OpenService(con, "ServiceTest", (uint)SERVICE_ACCESS.SERVICE_ALL_ACCESS);

         serviceHandle = Interop.OpenService (

     internal static extern IntPtr OpenService (IntPtr hSCManager, string lpServiceName, uint dwDesiredAccess);

        #region OpenService

        static extern IntPtr OpenService(IntPtr hSCManager, string lpServiceName, SERVICE_ACCESS dwDesiredAccess);

                    IntPtr schService = OpenService( schSCManager, txtServiceName.Text, SERVICE_ACCESS.SERVICE_ALL_ACCESS);

SERVICE_STATES, SERVICE_TYPES, ENUM_SERVICE_STATUS, OpenSCManager, EnumServicesStatus, and OpenService

         IntPtr hService = OpenService( handle, serviceStatus.pServiceName, SERVICE_ACCESS.SERVICE_ALL_ACCESS );

             Debug.WriteLine("OpenService Failed " + Marshal.GetLastWin32Error() );

static extern IntPtr OpenService(IntPtr hSCManager, string lpServiceName, uint dwDesiredAccess);

    Private Shared Function OpenService(ByVal hSCManager As IntPtr, ByVal lpServiceName As String, ByVal dwDesiredAccess As Int32) As IntPtr

    Declare Function OpenService Lib "advapi32.dll" Alias "OpenServiceA" (ByVal hSCManager As IntPtr, ByVal lpServiceName As String, ByVal dwDesiredAccess As Integer) As IntPtr

    IntPtr hService = OpenService(hSCM, ServiceName, ((uint)SERVICE_ACCESS.SERVICE_STOP |

        IntPtr serviceHandle = OpenService( databaseHandle, serviceName, SERVICE_QUERY_CONFIG );

            throw new System.Runtime.InteropServices.ExternalException( "Error OpenService\n" );

    public static extern IntPtr OpenService( IntPtr hSCManager, String lpServiceName, UInt32 dwDesiredAccess );

        IntPtr serviceHandle = OpenService( databaseHandle, serviceName, SERVICE_QUERY_CONFIG );

            throw new System.Runtime.InteropServices.ExternalException( "Error OpenService\n" );

    public static extern IntPtr OpenService( IntPtr hSCManager, String lpServiceName, UInt32 dwDesiredAccess );

See OpenService to get the hService.

See OpenService to get the hService.

    Dim scManager As IntPtr = OpenService(hSCManager, "Service_Name", SCAccess.SERVICE_ALL_ACCESS)