Send Meeting Request using Smtp methods

Posted on February 14, 2010

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Below code will help to send a meeting request to the give attendees. It is dynamicaly creating the .ics file which is hidden properties structure file for any appointment / calendar type action in Outlook.

Onces send the attendees will see the meeting requested in the mailbox and in their calendar after accepting. The code is tested in Outlook 2003 and 2007.

        //Create Meeting Request - Mail Message
        public static MailMessage CreateMeetingRequest(DateTime start, DateTime end, string subject,
                                string summary, string location, string organizerName,
                                string organizerEmail, string locationEmail, Hashtable attendeeEmailList)
        {
            MailAddressCollection col = new MailAddressCollection();
            foreach (DictionaryEntry de in attendeeEmailList)
                col.Add(new MailAddress(de.Value.ToString(), de.Key.ToString()));
 
            return CreateMeetingRequest(start, end, subject, summary, location,
                                            organizerName, organizerEmail, new MailAddress(locationEmail, location), col);
        }
 
        public static MailMessage CreateMeetingRequest(DateTime dtStart, DateTime dtEnd, string strSubject, string strSummary,
                                        string strLocation, string strOrganizerName, string strOrganizerEmail,
                                        MailAddress metRoom, MailAddressCollection metAttendeeList)
        {
            //Create an instance of mail message
            MailMessage mmMessage = new MailMessage();
            //  Set up the different mime types contained in the message
            System.Net.Mime.ContentType typeText = new System.Net.Mime.ContentType("text/plain");
            System.Net.Mime.ContentType typeHTML = new System.Net.Mime.ContentType("text/html");
            System.Net.Mime.ContentType typeCalendar = new System.Net.Mime.ContentType("text/calendar");
 
            //  Add parameters to the calendar header
            typeCalendar.Parameters.Add("method", "REQUEST");
            typeCalendar.Parameters.Add("name", "meeting.ics");
 
            //  Create message body parts in text format
            string strBodyText = "Type:Single Meeting\r\nOrganizer: {0}\r\nStart Time:{1}\r\nEnd Time:{2}\r\nTime Zone:{3}\r\nLocation: {4}\r\n\r\n*~*~*~*~*~*~*~*~*~*\r\n\r\n{5}";
            strBodyText = string.Format(strBodyText, strOrganizerName, dtStart.ToLongDateString() + " " + dtStart.ToLongTimeString(),
                                dtEnd.ToLongDateString() + " " + dtEnd.ToLongTimeString(), System.TimeZone.CurrentTimeZone.StandardName,
                                strLocation, strSummary);
            AlternateView viewText = AlternateView.CreateAlternateViewFromString(strBodyText, typeText);
            mmMessage.AlternateViews.Add(viewText);
 
            //Create the Body in HTML format
            string strBodyHTML = "<!DOCTYPE HTML PUBLIC \"-//W3C//DTD HTML 3.2//EN\">\r\n<HTML>\r\n<HEAD>\r\n<META HTTP-EQUIV=\"Content-Type\" CONTENT=\"text/html; charset=utf-8\">\r\n<META NAME=\"Generator\" CONTENT=\"MS Exchange Server version 6.5.7652.24\">\r\n<TITLE>{0}</TITLE>\r\n</HEAD>\r\n<BODY>\r\n<!-- Converted from text/plain format -->\r\n<P><FONT SIZE=2>Type:Single Meeting<BR>\r\nOrganizer:{1}<BR>\r\nStart Time:{2}<BR>\r\nEnd Time:{3}<BR>\r\nTime Zone:{4}<BR>\r\nLocation:{5}<BR>\r\n<BR>\r\n*~*~*~*~*~*~*~*~*~*<BR>\r\n<BR>\r\n{6}<BR>\r\n</FONT>\r\n</P>\r\n\r\n</BODY>\r\n</HTML>";
            strBodyHTML = string.Format(strBodyHTML, strSummary, strOrganizerName, dtStart.ToLongDateString() + " " + dtStart.ToLongTimeString(),
                                    dtEnd.ToLongDateString() + " " + dtEnd.ToLongTimeString(), System.TimeZone.CurrentTimeZone.StandardName,
                                    strLocation, strSummary);
            AlternateView viewHTML = AlternateView.CreateAlternateViewFromString(strBodyHTML, typeHTML);
            mmMessage.AlternateViews.Add(viewHTML);
 
            //Create the Body in VCALENDAR format
            string strCalDateFormat = "yyyyMMddTHHmmssZ";
 
            string strTextBodyCalendar = "BEGIN:VCALENDAR\r\nPRODID:-//Microsoft Corporation//Outlook 10.0 MIMEDIR//EN\r\nVERSION:2.0\r\nMETHOD:REQUEST\r\nBEGIN:VEVENT\r\nATTENDEE;CN=NMK;ROLE=REQ-PARTICIPANT;RSVP=TRUE:MAILTO:Manikandan.Narayannan@merrillcorp.com\r\nATTENDEE;CN=#RES-MTSI-CONF-Ardelis;ROLE=NON-PARTICIPANT;RSVP=TRUE:MAILTO:Ardelis@merrillcorp.com\r\nATTENDEE;CN=Sri;ROLE=REQ-PARTICIPANT;RSVP=TRUE:MAILTO:Sriraman.Srinivasan@merrillcorp.com\r\nORGANIZER:MAILTO:Subash.Vasudevan@merrillcorp.com\r\nDTSTART:20100108T203000Z\r\nDTEND:20100108T121000Z\r\nLOCATION:#RES-MTSI-CONF-Ardelis\r\nTRANSP:OPAQUE\r\nSEQUENCE:0\r\nUID:040000008200E00074C5B7101A82E0080000000090AA48ECF95BCA01000000000000000010000000F720C129F5F7A34E997F9CE6AE0680C2\r\nRECURRENCE-ID:20100106\r\nDTSTAMP:20091108T145030Z\r\nDESCRIPTION:Testing\r\nSUMMARY:QRM Meeting\r\nPRIORITY:5\r\nX-MICROSOFT-CDO-IMPORTANCE:1\r\nCLASS:PUBLIC\r\nBEGIN:VALARM\r\nTRIGGER:-PT15M\r\nACTION:DISPLAY\r\nDESCRIPTION:Reminder\r\nEND:VALARM\r\nEND:VEVENT\r\nEND:VCALENDAR";
 
            StringBuilder strBodyCalendar = new StringBuilder();
            strBodyCalendar.AppendLine("BEGIN:VCALENDAR");
            strBodyCalendar.AppendLine("PRODID:-//Microsoft Corporation//Outlook 10.0 MIMEDIR//EN");
            strBodyCalendar.AppendLine("VERSION:2.0");
            strBodyCalendar.AppendLine("METHOD:REQUEST");
            strBodyCalendar.AppendLine("BEGIN:VEVENT");
 
            foreach (MailAddress attendee in metAttendeeList)
            {
                mmMessage.To.Add(attendee);
                strBodyCalendar.AppendFormat("ATTENDEE;CN={0};ROLE=REQ-PARTICIPANT;RSVP=TRUE:MAILTO:{1}\r\n", attendee.DisplayName, attendee.Address);
            }
 
            if(!String.IsNullOrEmpty(metRoom.Address))
                strBodyCalendar.AppendFormat("ATTENDEE;CN={0};ROLE=NON-PARTICIPANT;RSVP=TRUE:MAILTO:{1}\r\n", metRoom.DisplayName, metRoom.Address);
 
            strBodyCalendar.AppendFormat("ORGANIZER:MAILTO:{0}\r\n", strOrganizerEmail);
            strBodyCalendar.AppendFormat("DTSTART:{0}\r\n", dtStart.ToUniversalTime().ToString(strCalDateFormat));
            strBodyCalendar.AppendFormat("DTEND:{0}\r\n",dtEnd.ToUniversalTime().ToString(strCalDateFormat));
            strBodyCalendar.AppendFormat("LOCATION:{0}\r\n", metRoom.DisplayName);
            strBodyCalendar.AppendFormat("TRANSP:OPAQUE\r\n");
            strBodyCalendar.AppendFormat("SEQUENCE:0\r\n");
            strBodyCalendar.AppendFormat("UID:{0}\r\n", Guid.NewGuid().ToString());
            strBodyCalendar.AppendFormat("DTSTAMP:{0}\r\n", DateTime.Now.ToUniversalTime().ToString(strCalDateFormat));
            strBodyCalendar.AppendFormat("DESCRIPTION:{0}\r\n", strSummary);
            strBodyCalendar.AppendFormat("SUMMARY:{0}\r\n", strSummary);
            strBodyCalendar.AppendLine("PRIORITY:5");
            strBodyCalendar.AppendLine("X-MICROSOFT-CDO-IMPORTANCE:1");
            strBodyCalendar.AppendLine("CLASS:PUBLIC");
            strBodyCalendar.AppendLine("BEGIN:VALARM");
            strBodyCalendar.AppendLine("TRIGGER:-PT15M");
            strBodyCalendar.AppendLine("ACTION:DISPLAY");
            strBodyCalendar.AppendLine("DESCRIPTION:Reminder");
            strBodyCalendar.AppendLine("END:VALARM");
            strBodyCalendar.AppendLine("END:VEVENT");
            strBodyCalendar.AppendLine("END:VCALENDAR");
 
            AlternateView viewCalendar = AlternateView.CreateAlternateViewFromString(strBodyCalendar.ToString(), typeCalendar);
            //viewCalendar.TransferEncoding = TransferEncoding.SevenBit;
            mmMessage.AlternateViews.Add(viewCalendar);
 
            //Adress the message
            mmMessage.From = new MailAddress(strOrganizerEmail);
            mmMessage.Subject = strSubject;
            return mmMessage;
        }