public void ClassFilter(string className)
 {
     if (className != "All")
     {
         JoinsList.Add("inner join Class cl on cl.id = c.class_id ");
         WhereList.Add($"cl.name = '{className}' ");
     }
 }
 public void UserFilter(int userId, bool isEditable)
 {
     if (!isEditable)
     {
         JoinsList.Add("Inner join UserCards u on c.id = u.cardId ");
         WhereList.Add($"u.userId = {userId} ");
     }
 }