private void LoadDuLieu()
{
dgvHocSinh.DataSource = HocSinhDAO.LoadDataHocSinh();
cboLop.DataSource = LopDAO.LoadDataLop1();
cboLop.ValueMember = "IDLop";
cboLop.DisplayMember = "TenLop";
AutoCompleteStringCollection ac = new AutoCompleteStringCollection();
DataTable dt = (DataTable)dgvHocSinh.DataSource;
for (int i = 0; i < dt.Rows.Count; i++)
{
ac.Add(dt.Rows[i][1].ToString());
}
txtTimKiem.AutoCompleteCustomSource = ac;
ReadOnly();
}