Domain.Factory.GetFactory C# (CSharp) Method

        public static Factory GetFactory() {
            if (factory == null)
            {
                factory = new Factory();
            }
            return factory;
        }
        public QualityTestFactory GetQTF() {

 internal void ChangeAllQualityTest(int ID, string testActivties, string result, string expResult, string comment
                                    , DateTime date, string employee, bool approved, bool done)
 {
     Persistance.DBController.getController().changeQualityTest(Factory.GetFactory().GetQTF().CreateQualityTest(ID, date, testActivties, expResult, employee, comment, result, approved, done));
 }