public void LoadThanhToan()
{
List <HDTC> dts;
if (cbFMonth.SelectedItem != null && cbFYear.SelectedItem != null)
{
dts = ThanhToanBUS.LoadThanhToan().Where(x =>
x.THANG.ToString() == cbFMonth.SelectedItem.ToString() &&
x.NAM.ToString() == cbFYear.SelectedItem.ToString()
).ToList();
}
else
{
dts = ThanhToanBUS.LoadThanhToan();
}
string keyword = tbKeyword.Text;
gvThanhToan.DataSource = dts.Where(x =>
keyword.Length == 0 ||
x.KHACHHANG.ToString().Contains(keyword) ||
x.IDSIM.Contains(keyword) ||
x.ThanhToan.Contains(keyword)
).ToList();
}