public IList <T> GetList()
 {
     using (var context = new ToDoListDbContext())
     {
         return(context.Set <T>().ToList());
     }
 }
 public T GetById(int id)
 {
     using (var context = new ToDoListDbContext())
     {
         return(context.Set <T>().Find(id));
     }
 }