create in C# an iCal file that will import appointments to an existing Outlook calender (not the default calender).

I need to create in C# an iCal file that will import appointments to an existing Outlook calender (not the default calender). For example if I have an Outlook calender named "Room booking" - how to create iCal file file so it will import to this specifc calendar? And I also have a second calendar in Outlook named "Machine booking" I need an iCal file that can add appointments to existing calendar "Room booking" or to "Machine booking" I've tested [login to view URL] NuGet package using "[login to view URL]("X-WR-CALNAME", "Room booking");" But this will not import iCal appointment to an existing calendar but does create new calendar "Room booking (1)" or Machine booking (1)" I need iCal file that Outlook recepients can doubleclick and import appontments into existing calendars but not create new calendars