Unable to import file with reminder to Microsoft Outlook

Question

Hi experts, I am doing a system whereby the user is able to download the timetable in (.ics) format and import the timetable into the Microsoft Outlook. In the system itself, it allow user to choose their reminder options, for example - 5 mins before, 15 mins before, 30 mins before 1 hour before, 2 hour before. 

I have tried many times and have failed to import the reminder into Microsoft Outlook. I would seek you help urgently. 

If you take a look at my file codes(MyCalendar_even30Mins), you should be able to see this statement: "TRIGGER:-PT30M", which means that I have selected 30 mins before and has been successfully retrieve out from the system. 

But the problem now is the reminder is not able to import into Microsoft Outlook. 

This is the code for my .ICS format:

 public class ICS : System.Web.UI.Page
{
    string description;
    string summary;
    string location;
    string shortday;
    string day;
    string endtimestr;
    string starttimestr;
    string weekType;



    public ICS()
    { }



    public void GenerateICS(String userId, String weekT, String sem, String yr, String reminder)
    {
        SQL dbAdapter1 = new SQL();
        DataTable resultTable =  new DataTable();
        //check if ALL week is selected
        if (weekT == ConfigurationSettings.AppSettings["A"])
        {
            //need filter semester,year only
            resultTable = dbAdapter1.GenerateICSAll(userId, sem, yr);

        }

        else
        {
            
            //need filter week_type,semester,year as well
            resultTable = dbAdapter1.GenerateICS(userId, weekT, sem, yr);
            
        }


        //semester start date should pull from db
        SQL dbAdapterSDate = new SQL();
        DataTable StartDate = dbAdapterSDate.SDate(sem, yr);
        DateTime semesterDate = Convert.ToDateTime(StartDate.Rows[0][0].ToString());

        if (resultTable.Rows.Count >= 0)// there are rows returned that matches this user id
        {
            foreach (DataRow row in resultTable.Rows)
            {

                {

                    StringBuilder sb = new StringBuilder();

                    //start calendar, END:VCALENDAR TO BE PUT AT THE END.
                    sb.Append("BEGIN:VCALENDAR");
                    sb.Append("\r\n");
                    sb.Append("PRODID:-//Microsoft Corporation//Outlook 12.0 MIMEDIR//EN");
                    sb.Append("\r\n");
                    sb.Append("VERSION:2.0");
                    sb.Append("\r\n");
                    sb.Append("METHOD:PUBLISH");
                    sb.Append("\r\n");
                    sb.Append("X-CALSTART:20100804T080000Z");
                    sb.Append("\r\n");
                    sb.Append("X-CALEND:20101215T003000Z");
                    sb.Append("\r\n");
                    sb.Append("X-WR-RELCALID:{00000018-052E-029C-0FA8-3CF5CAE164FF}");
                    sb.Append("\r\n");
                    sb.Append("X-WR-CALNAME:My Calendar");
                    sb.Append("\r\n");
                    sb.Append("X-MS-OLK-WKHRSTART;TZID=\"Malay Peninsula Standard Time\":080000");
                    sb.Append("\r\n");
                    sb.Append("X-MS-OLK-WKHREND;TZID=\"Malay Peninsula Standard Time\":170000");
                    sb.Append("\r\n");
                    sb.Append("X-MS-OLK-WKHRDAYS:MO,TU,WE,TH,FR");
                    sb.Append("\r\n");
                    sb.Append("BEGIN:VTIMEZONE");
                    sb.Append("\r\n");
                    sb.Append("TZID:Malay Peninsula Standard Time");
                    sb.Append("\r\n");
                    sb.Append("BEGIN:STANDARD");
                    sb.Append("\r\n");
                    sb.Append("DTSTART:16011104T020000");
                    sb.Append("\r\n");
                    sb.Append("RRULE:FREQ=YEARLY;BYDAY=1SU;BYMONTH=11");
                    sb.Append("\r\n");
                    sb.Append("TZOFFSETFROM:+0800");
                    sb.Append("\r\n");
                    sb.Append("TZOFFSETTO:+0800");
                    sb.Append("\r\n");
                    sb.Append("END:STANDARD");
                    sb.Append("\r\n");
                    sb.Append("END:VTIMEZONE");
                    sb.Append("\r\n");

                    //fill event if have lessons
                    for (int i = 0; i < resultTable.Rows.Count; i++)
                    {
                        //string description = resultTable.Rows[i][1].ToString(); //FAC_CODE - CL21
                        string location = resultTable.Rows[i][0].ToString() + ConfigurationSettings.AppSettings["COMMA"]  + ConfigurationSettings.AppSettings["SPACE"] + resultTable.Rows[i][1].ToString();   // ACT_TYPE - Lab 5
                        string summary = resultTable.Rows[i][2].ToString();   // Module_Code - IT35771
                        string weekType = resultTable.Rows[i][6].ToString();


                        shortday = resultTable.Rows[i][3].ToString().Substring(0,2);
                        day = resultTable.Rows[i][3].ToString();
                        starttimestr = resultTable.Rows[i][4].ToString();
                        endtimestr = resultTable.Rows[i][5].ToString();

                        Util util = new Util();
                        string datestr = util.getTodayDate().ToString();
                        Util util2 = new Util();
                        string tempstr = util2.getDateStr(semesterDate, day, starttimestr).ToString();
                        Util util3 = new Util();
                        string tempstr2 = util3.getDateStr2(semesterDate, day, endtimestr).ToString();
                        Util util4 = new Util();
                        string tempstrE = util2.getDateStr(semesterDate.AddDays(int.Parse(ConfigurationSettings.AppSettings["DAYS_PER_WEEK"])), day, starttimestr).ToString();
                        Util util5 = new Util();
                        string tempstr2E = util3.getDateStr2(semesterDate.AddDays(int.Parse(ConfigurationSettings.AppSettings["DAYS_PER_WEEK"])), day, endtimestr).ToString();

                        sb.Append("BEGIN:VEVENT");
                        sb.Append("\r\n");
                        sb.Append("CLASS:PUBLIC");
                        sb.Append("\r\n");
                        sb.Append("CREATED:" + datestr);
                        sb.Append("\r\n");
                        sb.Append("DESCRIPTION:" + description + "\\n");
                        sb.Append("\r\n");
                        sb.Append("DTSTAMP:20100721T220121Z");
                        sb.Append("\r\n");

                        //generate event/lessons for even week
                        if (resultTable.Rows[i][6].ToString() == ConfigurationSettings.AppSettings["EVENWEEK"])
                        {
                            int repeat = int.Parse(ConfigurationSettings.AppSettings["STUDYWEEKS_PER_SEM"]) / 2;
                            //nid to edit dtart/dtend +7 days to start
                            sb.Append("DTSTART;TZID=\"Malay Peninsula Standard Time\":" + tempstrE);
                            sb.Append("\r\n");
                            sb.Append("DTEND;TZID=\"Malay Peninsula Standard Time\":" + tempstr2E);
                            sb.Append("\r\n");
                            sb.Append("LAST-MODIFIED:" + datestr);
                            sb.Append("\r\n");
                            sb.Append("LOCATION:" + location);
                            sb.Append("\r\n");
                            sb.Append("PRIORITY:5");
                            sb.Append("\r\n");
                            sb.Append("RRULE:FREQ=WEEKLY;COUNT=" + repeat + ";INTERVAL=2;BYDAY=" + shortday);
                            sb.Append("\r\n");
                        }
                        //generate event/lessons for odd week
                        else if (resultTable.Rows[i][6].ToString() == ConfigurationSettings.AppSettings["ODDWEEK"])
                        {
                            //count amount of repeats of timeslot
                            int repeat = 0;
                            if (int.Parse(ConfigurationSettings.AppSettings["STUDYWEEKS_PER_SEM"]) % 2 == 1)
                            {
                                repeat = (int.Parse(ConfigurationSettings.AppSettings["STUDYWEEKS_PER_SEM"]) / 2) + 1;
                            }
                            else 
                            {
                                repeat = int.Parse(ConfigurationSettings.AppSettings["STUDYWEEKS_PER_SEM"]) / 2;
                            }
                            sb.Append("DTSTART;TZID=\"Malay Peninsula Standard Time\":" + tempstr);
                            sb.Append("\r\n");
                            sb.Append("DTEND;TZID=\"Malay Peninsula Standard Time\":" + tempstr2);
                            sb.Append("\r\n");
                            sb.Append("LAST-MODIFIED:" + datestr);
                            sb.Append("\r\n");
                            sb.Append("LOCATION:" + location);
                            sb.Append("\r\n");
                            sb.Append("PRIORITY:5");
                            sb.Append("\r\n");
                            sb.Append("RRULE:FREQ=WEEKLY;COUNT=" + repeat + ";INTERVAL=2;BYDAY=" + shortday);
                            sb.Append("\r\n");
                        }
                        // generate events/lessons for every
                        else 
                        {
                            sb.Append("DTSTART;TZID=\"Malay Peninsula Standard Time\":" + tempstr);
                            sb.Append("\r\n");
                            sb.Append("DTEND;TZID=\"Malay Peninsula Standard Time\":" + tempstr2);
                            sb.Append("\r\n");
                            sb.Append("LAST-MODIFIED:" + datestr);
                            sb.Append("\r\n");
                            sb.Append("LOCATION:" + location);
                            sb.Append("\r\n");
                            sb.Append("PRIORITY:5");
                            sb.Append("\r\n");
                            sb.Append("RRULE:FREQ=WEEKLY;COUNT=" + int.Parse(ConfigurationSettings.AppSettings["STUDYWEEKS_PER_SEM"]) + ";BYDAY=" + shortday);
                            sb.Append("\r\n");
                        }
                        sb.Append("SEQUENCE:0");
                        sb.Append("\r\n");
                        sb.Append("SUMMARY;LANGUAGE=en-us:" + summary);
                        sb.Append("\r\n");
                        sb.Append("TRANSP:TRANSPARENT");
                        sb.Append("\r\n");
                        sb.Append("UID:" + datestr + i + "@infosys.com");
                        sb.Append("\r\n");

                        sb.Append("X-ALT-DESC;FMTTYPE=text/html:");
                        sb.Append("<!DOCTYPE HTML PUBLIC \"-//W3C//DTD HTML 3.2//EN\">");
                        sb.Append("\\n");
                        sb.Append("<HTML>");
                        sb.Append("\\n");
                        sb.Append("<HEAD>");
                        sb.Append("\\n");
                        sb.Append("<META NAME=\"Generator\" CONTENT=\"MS Exchange Server version 08.00.0681.000\">");
                        sb.Append("\\n");
                        sb.Append("<TITLE></TITLE>");
                        sb.Append("\\n");
                        sb.Append("</HEAD>");
                        sb.Append("\\n");
                        sb.Append("<BODY>");
                        sb.Append("\\n");
                        sb.Append("<!-- Converted from text/rtf format -->");
                        sb.Append("\\n");
                        sb.Append("\\n");
                        sb.Append("<P DIR=LTR><SPAN LANG=\"en-us\"><FONT FACE=\"Calibri\">" + description + "</FONT></SPAN></P>");
                        sb.Append("\\n");
                        sb.Append("\\n");
                        sb.Append("</BODY>");
                        sb.Append("\\n");
                        sb.Append("</BODY");
                        sb.Append("\\n");
                        sb.Append("\r\n");
                        //set busy status
                        sb.Append("X-MICROSOFT-CDO-BUSYSTATUS:" + ConfigurationSettings.AppSettings["BUSYSTATUS"]);
                        sb.Append("\r\n");
                        sb.Append("X-MICROSOFT-CDO-IMPORTANCE:1");
                        sb.Append("\r\n");
                        sb.Append("X-MICROSOFT-DISALLOW-COUNTER:FALSE");
                        sb.Append("\r\n");
                        sb.Append("X-MS-OLK-ALLOWEXTERNCHECK:TRUE");
                        sb.Append("\r\n");
                        sb.Append("X-MS-OLK-AUTOFILLLOCATION:FALSE");
                        sb.Append("\r\n");
                        sb.Append("X-MS-OLK-AUTOSTARTCHECK:FALSE");
                        sb.Append("\r\n");
                        sb.Append("X-MS-OLK-CONFTYPE:0");
                        sb.Append("\r\n");

                        //set reminder
                        if (reminder != "--None--")
                        {

                            sb.Append("BEGIN:VALARM");
                            sb.Append("\r\n");
                            //time for reminder in minutes
                            //sb.Append("TRIGGER:-PT"+ ConfigurationSettings.AppSettings["REMINDERTIME"] +"M");
                            sb.Append("TRIGGER:-PT" + reminder + "M");
                            sb.Append("\r\n");
                            sb.Append("ACTION:DISPLAY");
                            sb.Append("\r\n");
                            sb.Append("DESCRIPTION:Reminder");
                            sb.Append("\r\n");
                            sb.Append("END:VALARM");
                            sb.Append("\r\n");
                        }

                        sb.Append("END:VEVENT");
                        sb.Append("\r\n");

                    } 
                    sb.Append("END:VCALENDAR");
                    sb.Append("\r\n");

                    HttpResponse response = System.Web.HttpContext.Current.Response;
                    response.Write(sb);
                    response.ContentType = "text/calendar";
                    response.Charset = "utf-8";
                    //to export as 
                    response.AddHeader("Content-Disposition", "attachment;filename=\"MyCalendar.ics\"");
                    response.End();
                }
            }
        }
    }
}

Thanks in advanced!