private void detach_TestSub(TestSub entity)
 {
     this.SendPropertyChanging();
     entity.TestMain = null;
 }
 private void attach_TestSub(TestSub entity)
 {
     this.SendPropertyChanging();
     entity.TestMain = this;
 }
 partial void UpdateTestSub(TestSub instance);
 partial void DeleteTestSub(TestSub instance);
 partial void InsertTestSub(TestSub instance);