public DataTable GetAll()
 {
     using (PersistentManager persistentManager = new PersistentManager())
     {
         SysUserDao userDao = new SysUserDao();
         return userDao.FindAll();
     }
 }
 public DataSet GetUserList(int pageIndex, int pageSize, string filter)
 {
     using (PersistentManager persistentManager = new PersistentManager())
     {
         SysUserDao userDao = new SysUserDao();
         return userDao.FindAll((pageIndex - 1) * pageSize, pageSize, filter);
     }
 }