private void btndangnhap_Click(object sender, EventArgs e)
{
GiaoVien gv = new GiaoVien();
gv.username = txttk.Text.Trim();
gv.pass = txtmk.Text.Trim();
if (GiaoVienController.DangNhap(gv) == null)
{
MessageBox.Show("Vui long kiem tra tai khoan va mat khau");
return;
}
gv = GiaoVienController.DangNhap(gv);
frmMain mf = new frmMain(gv.IDGiaoVien, (int)gv.ad);
mf.Show();
this.Hide();
}
