How to import morethan 65000 records in same sheet of excel usnig C#

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C#

ASP.NET

C#4.0

In having a data in a datatable.
im having 1 lakh record in the datatable.Im exporting that datatable to excel.
Its correctly importing.
But im geetiing 65000 records in first sheet and remaining 35000 records in second sheet.
my issue is that i have import all the 1 lakh records in same sheet and not and two sheets of the excel..can someone please give me sloution for this.

Im using this C# code..

rvexam.Reset();
                            rvexam.Visible = true;
                            rvexam.LocalReport.ReportPath = Server.MapPath("~/PortalGUI/University/Reports/DFormReport.rdlc");
                            rvexam.Visible = true;
                            rvexam.LocalReport.DataSources.Clear();
                            Microsoft.Reporting.WebForms.ReportDataSource ordSub = new Microsoft.Reporting.WebForms.ReportDataSource("dsDform", dtDform);
                            Microsoft.Reporting.WebForms.ReportDataSource ordsUnivInfo = new Microsoft.Reporting.WebForms.ReportDataSource("dsUniv", dtUnivInfo);
                            rvexam.LocalReport.DataSources.Add(ordSub);
                            rvexam.LocalReport.DataSources.Add(ordsUnivInfo);
                            rvexam.LocalReport.Refresh();
                            mpereportViwer1.Show();
                            byte[] bytes = rvexam.LocalReport.Render("EXCEL"); // , null, out mimeType, out encoding, out extension, out streamIds, out warnings);
                            Response.Buffer = true;
                            Response.Clear();
                            Response.ContentType = "application/CSV";
                            Response.AddHeader("content-disposition", "attachment; filename=Dfrom.CSV");
                            Response.BinaryWrite(bytes); // create the file   
                            Response.Flush();

pls give me any alternate solution for this...