Authentication with Google Calendar API using Server Account and .NET - google-calendar-api

Question

I'm using Google Calendar API V3, with OAuth2 & .NET.
my authentication is by Service Account, since i need to run it as a service, without user interface.
I've managed, after a lot of struggle to authenticate with the credentials, but for some reason i can't create an event on my calendar (& yes, i shared it with my self...).
i found a lot of questions regarding some same issues, but all in php, which i don't really know or think it will help me.
i seek for some help. Thanks
String serviceAccountEmail = "XXX#developer.gserviceaccount.com";
var certificate = new X509Certificate2(#"key.p12", "notasecret", X509KeyStorageFlags.MachineKeySet |X509KeyStorageFlags.PersistKeySet | X509KeyStorageFlags.Exportable);
ServiceAccountCredential credential = new ServiceAccountCredential(
new ServiceAccountCredential.Initializer(serviceAccountEmail)
{
Scopes = new[] { CalendarService.Scope.Calendar }
}.FromCertificate(certificate));
// Create the service.
var service = new CalendarService(new BaseClientService.Initializer()
{
HttpClientInitializer = credential,
ApplicationName = "Calendar API Sample",
});
Event e = new Event()
{
Summary = "Appointment1",
Location = "42.138679, -88.045519",
Start = new EventDateTime()
{
DateTime = DateTime.Now,
TimeZone = "Asia/Jerusalem"
},
End = new EventDateTime()
{
DateTime = DateTime.Now.AddDays(1),
TimeZone = "Asia/Jerusalem"
},
};
Event createdEvent = service.Events.Insert(e, "primary").Execute();

Answer 1

For some reason, the Insert event to a "primary" calendar, didn't do the job.
Instead, i wrote the following code, which allowed me to write the event.
var list = service.CalendarList.List().Execute().Items;
service.Events.Insert(e, list[0].Id).Execute();
This is my solution for this problem, I also agree with Craig here that the API is not well organized. (saying this after working with the amazing API of maps).

Answer 2

Perhaps try specifying the user programmatically, rather than sharing the calendar with your service account e-mail? The following worked in my application:
ServiceAccountCredential credential = new ServiceAccountCredential(
new ServiceAccountCredential.Initializer(serviceAccountEmail)
{
User = "youremail#yourdomain.com",
Scopes = new[] { CalendarService.Scope.Calendar }
}.FromCertificate(certificate));
// ... Define the event
service.Events.Insert(e, "primary").Execute();