enum SERVICE_TYPES : int

    <Flags()> Public Enum SERVICE_TYPES : int32

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

                 SERVICE_TYPES.SERVICE_WIN32,

                     SERVICE_TYPES.SERVICE_WIN32,

     public SERVICE_TYPES dwServiceType;

Easier Structure (which appears to work fine and allows you to avoid defining the SERVICE_TYPES and SERVICE_STATE enumerations and to use CLR compliant types (int)):

See SERVICE_TYPES definition.