Abstractions.WindowsApi.pInvokes.IsSessionLoggedOFF C# (CSharp) Method

        public static bool IsSessionLoggedOFF(int session)
        {
            SafeNativeMethods.WTS_SESSION_INFO sessionInfo = new SafeNativeMethods.WTS_SESSION_INFO();
            // if WTSQuerySessionInformation returns false than the session is already closed
            // WTSQuerySessionInformation returns zero if the session is logged off.
            sessionInfo.State = SafeNativeMethods.WTS_CONNECTSTATE_CLASS.WTSReset;
            uint bytes = 0;
            IntPtr userInfo = IntPtr.Zero;

            bool sResult = SafeNativeMethods.WTSQuerySessionInformation(SafeNativeMethods.WTS_CURRENT_SERVER_HANDLE, session, SafeNativeMethods.WTS_INFO_CLASS.WTSConnectState, out userInfo, out bytes);
            if (sResult)
            {
                int lData = Marshal.ReadInt32(userInfo);
                sessionInfo.State = (SafeNativeMethods.WTS_CONNECTSTATE_CLASS)Enum.ToObject(typeof(SafeNativeMethods.WTS_CONNECTSTATE_CLASS), lData);
                /*
                switch (sessionInfo.State)
                {
                    case SafeNativeMethods.WTS_CONNECTSTATE_CLASS.WTSActive:
                        ret = "WTSActive";
                        break;
                    case SafeNativeMethods.WTS_CONNECTSTATE_CLASS.WTSConnected:
                        ret = "WTSConnected";
                        break;
                    case SafeNativeMethods.WTS_CONNECTSTATE_CLASS.WTSConnectQuery:
                        ret = "WTSConnectQuery";
                        break;
                    case SafeNativeMethods.WTS_CONNECTSTATE_CLASS.WTSDisconnected:
                        ret = "WTSDisconnected";
                        break;
                    case SafeNativeMethods.WTS_CONNECTSTATE_CLASS.WTSDown:
                        ret = "WTSDown";
                        break;
                    case SafeNativeMethods.WTS_CONNECTSTATE_CLASS.WTSIdle:
                        ret = "WTSIdle";
                        break;
                    case SafeNativeMethods.WTS_CONNECTSTATE_CLASS.WTSInit:
                        ret = "WTSInit";
                        break;
                    case SafeNativeMethods.WTS_CONNECTSTATE_CLASS.WTSListen:
                        ret = "WTSListen";
                        break;
                    case SafeNativeMethods.WTS_CONNECTSTATE_CLASS.WTSReset:
                        ret = "WTSReset";
                        break;
                    case SafeNativeMethods.WTS_CONNECTSTATE_CLASS.WTSShadow:
                        ret = "WTSShadow";
                        break;
                }
                */
            }
            SafeNativeMethods.WTSFreeMemory(userInfo);
            return (sessionInfo.State == SafeNativeMethods.WTS_CONNECTSTATE_CLASS.WTSReset) ? true : false;
        }