private void tsAddClass_Click(object sender, EventArgs e)
{
frmClass frm = new frmClass();
ClassController classController = new ClassController();
Class addClass = new Class();
lap:
frm.SetInPut(addClass);
frm.ShowDialog();
if (frm.DialogResult == DialogResult.OK)
{
addClass = frm.getClass();
if (classController.Insert(addClass) == 1)
{
}
else
{
MessageBox.Show("Lớp đã tồn tại.");
goto lap;
}
showTreeView();
}
}