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    <p>To make sure I understand your question, you wish to offer a "download as .ical" button on your web application, dynamically populated with the specific calendar event data from your application?</p> <p>Think of an ical file (or more accurately, a .ics file) as just a string, but with a different Mime Type. The following describes the basics of the iCalendar format:</p> <p><a href="http://en.wikipedia.org/wiki/ICalendar" rel="nofollow">http://en.wikipedia.org/wiki/ICalendar</a></p> <p>In ASP.NET, I'd recommend creating a handler (.ashx instead of .aspx) because it is more efficient if you don't need to serve a complete web page. In the handler, replace the ProcessRequest method with something like this (credit goes to <a href="http://webdevel.blogspot.com/2006/02/how-to-generate-icalendar-file-aspnetc.html" rel="nofollow">http://webdevel.blogspot.com/2006/02/how-to-generate-icalendar-file-aspnetc.html</a>)</p> <pre><code>private string DateFormat { get { return "yyyyMMddTHHmmssZ"; } // 20060215T092000Z } public void ProcessRequest(HttpContext context) { DateTime startDate = DateTime.Now.AddDays(5); DateTime endDate = startDate.AddMinutes(35); string organizer = "foo@bar.com"; string location = "My House"; string summary = "My Event"; string description = "Please come to\\nMy House"; context.Response.ContentType="text/calendar"; context.Response.AddHeader("Content-disposition", "attachment; filename=appointment.ics"); context.Response.Write("BEGIN:VCALENDAR"); context.Response.Write("\nVERSION:2.0"); context.Response.Write("\nMETHOD:PUBLISH"); context.Response.Write("\nBEGIN:VEVENT"); context.Response.Write("\nORGANIZER:MAILTO:" + organizer); context.Response.Write("\nDTSTART:" + startDate.ToUniversalTime().ToString(DateFormat)); context.Response.Write("\nDTEND:" + endDate.ToUniversalTime().ToString(DateFormat)); context.Response.Write("\nLOCATION:" + location); context.Response.Write("\nUID:" + DateTime.Now.ToUniversalTime().ToString(DateFormat) + "@mysite.com"); context.Response.Write("\nDTSTAMP:" + DateTime.Now.ToUniversalTime().ToString(DateFormat)); context.Response.Write("\nSUMMARY:" + summary); context.Response.Write("\nDESCRIPTION:" + description); context.Response.Write("\nPRIORITY:5"); context.Response.Write("\nCLASS:PUBLIC"); context.Response.Write("\nEND:VEVENT"); context.Response.Write("\nEND:VCALENDAR"); context.Response.End(); } </code></pre>
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    1. POImport / Export .ical in Google Calendar API
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    1. COWow, thanks! :-) But you see, I'm not doing it in ASP.NET and I'm not acquainted with it. It's a stand-alone application I'm developing in C#. In Google Calendar there is this button and when I clck it, I download the .ics file. I don't know where to get the .ics file address and how to implement it.... Can I use tha ebove code to it? Thank you very much for your valuable help!
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    2. COOops, I saw C# and .NET in the tag cloud, and I jumped to ASP.NET. I think what you're wanting to do is discover the URL of the .ics file for a specific Google Calendar - and then use that URL within your application. Is that correct? If your calendar is listed as a public calendar, then it's just a matter of right-clicking on the green ICAL button and copying that URL. I suspect you're needing to access private calendars in a more dynamic way, though. In that case, you'll need to use the Google Calendar API for .NET: http://code.google.com/apis/calendar/data/2.0/developers_guide_dotnet.html
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