private void frmCR_BanHang_Load(object sender, EventArgs e) { using (DataBanHang data = new DataBanHang()) { CR_BanHang cR_BanHang = new CR_BanHang(); var result = data.sp_BillBanHang().ToList(); CollectionHelper ch = new CollectionHelper(); DataTable dt = ch.ConvertTo(result); cR_BanHang.SetDataSource(dt); crBanHang.ReportSource = cR_BanHang; } }