public static void Test() { COMEndpoint endpoint = new COMEndpoint("CDMDEV"); Console.WriteLine("Activity ID:"); string activityId = Console.ReadLine().Trim(); Console.WriteLine("Contact Email:"); string email = Console.ReadLine().Trim(); Activity activity = endpoint.GetActivityById(activityId); if (activity == null) { Console.WriteLine("Activity not found"); return; } List<Contact> toAdd = new List<Contact>(); Contact contact = endpoint.GetContactByEmail(email, null); if (contact == null) { Console.WriteLine("Contact not found"); } toAdd.Add(endpoint.GetContactByEmail(email, null)); endpoint.AddParticipantsToActivity(activity, toAdd); }