// Create project instance
System::SharedPtr<Project> project = System::MakeObject<Project>();
    
// Add task
System::SharedPtr<Task> tsk1 = project->get_RootTask()->get_Children()->Add(u"Task1");
    
// Create calendar and assign to task
System::SharedPtr<Aspose::Tasks::Calendar> cal = project->get_Calendars()->Add(u"TaskCal1");
tsk1->Set<System::SharedPtr<Calendar>>(Tsk::Calendar(), cal);