private void Delete_Click(object sender, MouseEventArgs e, ClassModel model)
        {
            var confirmResult = MessageBox.Show("Are you sure you want to delete this class?",
                                                "Confirm Delete",
                                                MessageBoxButtons.YesNo);

            if (confirmResult == DialogResult.Yes)
            {
                ClassController ccontroller = new ClassController();
                try
                {
                    AttendanceController acontroller = new AttendanceController();
                    acontroller.DeleteAllByClass(model.Id);

                    ccontroller.Delete(model);
                    MessageBox.Show("Deleted!");
                }
                catch (Exception ex)
                {
                    MessageBox.Show(ex.Message);
                }
            }
        }