private void ShowDoanhthuKH(DateTime from, DateTime to) { DataTable dt = tDoanhthuKH.SetData(from, to); RPT.rptDoanhthuKH rpt = new RPT.rptDoanhthuKH(); rpt.SetDataSource(dt); crystalReportViewer1.ReportSource = rpt; crystalReportViewer1.Refresh(); dt.Clear(); }