Creating a Dynamic iCalendar Feed

I am looking for a means to generate a iCalendar feed using .Net , atm I am using the DDay library to generate the iCal file and write it to the response.

The problem with this is if I feed the URL to outlook it says that it is a invalid ics file.

I have tried various routes including :

Using MVC routing so that the link contains a .ics extension. Changing the Mime Type so that it is Text/Calendar.

One observation I have found is that if I navigate to the URL in a browser a valid iCal file is generated and is imported int开发者_运维百科o Outlook correctly. Secondly if I take that exactly file and host it via IIS as static content , Outlook picks it up as a valid file.

The problem is that I need to generate a Dynamic feed and seem to have run out of things to try and get this working.

It seems the problem in my case was that the default asp.net auth was blocking outlook because it was not authenticating , once a exception was added to the web.config , the URL loaded correctly in outlook