/// <summary>
        /// GetServiceSidPtr method implementation
        /// </summary>
        private static IntPtr GetServiceSidPtr(string service)
        {
            NativeMethods.LSA_UNICODE_STRING lSA_UNICODE_STRING = default(NativeMethods.LSA_UNICODE_STRING);
            lSA_UNICODE_STRING.SetTo(service);
            int    cb     = 0;
            IntPtr intPtr = IntPtr.Zero;
            IntPtr result;

            try
            {
                uint num = NativeMethods.RtlCreateServiceSid(ref lSA_UNICODE_STRING, IntPtr.Zero, ref cb);
                if (num == 3221225507u)
                {
                    intPtr = Marshal.AllocHGlobal(cb);
                    num    = NativeMethods.RtlCreateServiceSid(ref lSA_UNICODE_STRING, intPtr, ref cb);
                }
                if (num != 0u)
                {
                    throw new Win32Exception(Convert.ToInt32(num));
                }
                result = intPtr;
            }
            finally
            {
                lSA_UNICODE_STRING.Dispose();
            }
            return(result);
        }
 internal static extern uint RtlCreateServiceSid(ref NativeMethods.LSA_UNICODE_STRING serviceName, IntPtr serviceSid, ref int serviceSidLength);