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 ical.Net NuGet package using "calendar.AddProperty("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