public Task Convert()
{
Task task = new Task(Name, Description, Note, Priority, State, Deadline)
{
ID = ID, Created = Created, Updated = Updated, Closed = Closed
};
task.Activities.AddRange(Activities.Select(x => x.Convert()));
task.Tags.AddRange(Tags.Select(x => x.Convert()));
task.Attachments.AddRange(Attachments.Select(x => x.Convert()));
task.Drawings.AddRange(Drawings.Select(x => x.Convert()));
task.SubTasks.AddRange(SubTasks.Select(x => x.Convert()));
return(task);
}