public void AddComment(int taskId, int employeeId, string text)
{
if (!repository.CheckIdExistence(taskId))
{
throw new NonexistentTask();
}
TaskDTO taskDto = ConvertDalToBbl(repository.GetById(taskId));
taskDto.AddComment(text);
taskDto.LastModifiedDate = MyDate.GetDate();
repository.Update(ConvertBblToDal(taskDto));
changeRepository.Create(ConvertBblToDal(new TaskChangeDTO(taskId, employeeId, "New comment added")));
}