public void loadData()
{
cboMaSV.Items.Add("Choose Student");
cboMaSV.SelectedIndex = cboMaSV.FindStringExact("Choose Student");
btnSearch.Enabled = false;
ds = SinhVienDAO.LoadSinhVienToComboBox();
DataTable dt = ds.Tables[0];
for (int i = 0; i < dt.Rows.Count; i++)
{
cboMaSV.Items.Add(dt.Rows[i].Field <int>("MASV"));
}
}
