private void LoadTinhTrang()
{
BLKhachHang BLKH = new BLKhachHang();
List <string> dsTrangThai = new List <string>();
dsTrangThai.Clear();
dsTrangThai = BLKH.LayTinhTrang();
cbbTinhTrang.Items.Clear();
cbbTinhTrang.Items.Add("ALL");
foreach (string TrangThai in dsTrangThai)
{
cbbTinhTrang.Items.Add(TrangThai);
}
}