private void detach_Question_categories(Question_category entity)
{
this.SendPropertyChanging();
entity.Category = null;
}
partial void DeleteQuestion_category(Question_category instance);
partial void InsertQuestion_category(Question_category instance);
partial void UpdateQuestion_category(Question_category instance);
private void attach_Question_categories(Question_category entity)
{
this.SendPropertyChanging();
entity.Question = this;
}