How to send and cancel outlook meeting request in web using C#.net

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I need to send/create a meeting request in the outlook calender on a button click. Also need to cancel/edit the same meeting details on another btn click event,.
Please help me in doing the same.Tried many possibilities but not working

Posted 19-Dec-14 22:50pm

Member 11045379

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syed shanu · Answer 1 · 2014-12-21T17:31:00

Solution 1

Check this links hope this will help you.
http://kobikobi.wordpress.com/2009/01/03/sending-meeting-requests-to-outlook-via-aspnet-mail-message/[^]

http://msdn.microsoft.com/en-us/library/office/bb655909(v=office.12).aspx[^]

http://ahmedblog.com/Blogs/ShowBlog.aspx?Id=2dc7e9e7-92b4-48cc-a7d1-d6535e5554ab[^]

http://www.c-sharpcorner.com/Blogs/11485/[^]

http://www.experts-exchange.com/Programming/Languages/.NET/Q_23578027.html[^]

http://stackoverflow.com/questions/27383906/send-an-outlook-meeting-request-with-c-sharp[^]

https://www.add-in-express.com/creating-addins-blog/2013/06/10/outlook-calendar-appointment-meeting-items/[^]

To Caancel :
http://stackoverflow.com/questions/2654743/cancel-outlook-meeting-requests-via-mailmessage-in-c-sharp[^]

http://stackoverflow.com/questions/461889/sending-outlook-meeting-requests-without-outlook[^]

http://stackoverflow.com/questions/11437501/delete-an-outlook-appointment-created-using-c-sharp-and-updating-category-of-out[^]

Posted 21-Dec-14 17:31pm

syed shanu

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Member 11045379 28-Jan-15 7:00am

Thankyou It worked within the same domain users.
But facing another issue. I want to send meeting outside the domain.But below exception is getting :
Mailbox unavailable. The server response was: 5.7.1 Unable to relay

Below is my code:

MailMessage msg = new MailMessage();
msg.From = new MailAddress("from@fromdomain.com");
msg.To.Add(new MailAddress("to@different.com"));
msg.Subject = "Training2";
msg.Body = "Test2";

StringBuilder str = new StringBuilder();
str.AppendLine("BEGIN:VCALENDAR");

//PRODID: identifier for the product that created the Calendar object
str.AppendLine("PRODID:-//ABC Company//Outlook MIMEDIR//EN");
str.AppendLine("VERSION:2.0");
str.AppendLine("X-WR-RELCALID:ABC2");
str.AppendLine("METHOD:REQUEST");

str.AppendLine("BEGIN:VEVENT");

str.AppendLine(string.Format("DTSTART:{0:yyyyMMddTHHmmssZ}", startTime1));
str.AppendLine(string.Format("DTSTAMP:{0:yyyyMMddTHHmmssZ}", DateTime.Now));
str.AppendLine(string.Format("DTEND:{0:yyyyMMddTHHmmssZ}", endTime1));
str.AppendLine(string.Format("LOCATION: {0}", "Location"));

id = Guid.NewGuid();
// UID should be unique.
str.AppendLine(string.Format("UID:{0}", id));
str.AppendLine(string.Format("SEQUENCE:{0}", 0));

str.AppendLine(string.Format("DESCRIPTION:{0}", msg.Body));
str.AppendLine(string.Format("X-ALT-DESC;FMTTYPE=text/html:{0}", msg.Body));
str.AppendLine(string.Format("SUMMARY:{0}", msg.Subject));

str.AppendLine("STATUS:CONFIRMED");
//str.AppendLine("BEGIN:VALARM");
//str.AppendLine("TRIGGER:-PT15M");
//str.AppendLine("ACTION:Accept");
//str.AppendLine("DESCRIPTION:Reminder");
//str.AppendLine("X-MICROSOFT-CDO-BUSYSTATUS:BUSY");
//str.AppendLine("END:VALARM");
str.AppendLine("END:VEVENT");

str.AppendLine(string.Format("ORGANIZER:MAILTO:{0}", msg.From.Address));
str.AppendLine(string.Format("ATTENDEE;CN=\"{0}\";RSVP=TRUE:mailto:{1}", msg.To[0].DisplayName, msg.To[0].Address));

str.AppendLine("END:VCALENDAR");
System.Net.Mime.ContentType ct = new System.Net.Mime.ContentType("text/calendar");
ct.Parameters.Add("method", "REQUEST");
ct.Parameters.Add("name", "meeting.ics");
AlternateView avCal = AlternateView.CreateAlternateViewFromString(str.ToString(), ct);
msg.AlternateViews.Add(avCal);
//Response.Write(str);
// sc.ServicePoint.MaxIdleTime = 2;
sc.Send(msg);

Please help.