private void ComboxDead_Load(object sender, EventArgs e)
{
BUSGiaoVien a = new BUSGiaoVien();
DataTable dt = a.DeadCombobox(cbLopCapNhatDead.Text, IDNguoiDung);
dt.Columns.Add("madead", typeof(string));
dt.Dispose();
cbMaDead.ValueMember = "madead";
cbMaDead.DataSource = dt;
}
