To Export the Crystal Report from Dataset through the C# Codes

// To create the DataSet by adding Add->new Item..

        private void btnReport_Click(object sender, EventArgs e)
        {
            ReportDocument cryRpt;
            ExportOptions CrExportOptions;
            DiskFileDestinationOptions CrDiskFileDestinationOptions;
            PdfRtfWordFormatOptions CrFormatTypeOptions;
                cryRpt = new ReportDocument();
                cryRpt.Load("C:\\LawrenceSoft\\Sample.rpt");
                DataSet DataNew = new DataSet();
                DataNew.ReadXml("F:\\LawrenceSoft\\VatDetails.xml");
                DataTable dtReportSource = (DataTable)DataNew.Tables[0];
                cryRpt.SetDataSource(dtReportSource);

                CrDiskFileDestinationOptions = new DiskFileDestinationOptions();
                CrFormatTypeOptions = new PdfRtfWordFormatOptions();
                SaveFileDialog sfdSavePDF = new SaveFileDialog();
                sfdSavePDF.OverwritePrompt = true;
                sfdSavePDF.SupportMultiDottedExtensions = true;
                sfdSavePDF.Filter = "PDF files (*.pdf)|*.pdf";
                sfdSavePDF.ShowDialog(this);
                CrDiskFileDestinationOptions.DiskFileName = sfdSavePDF.FileName;//@"c:\\test.pdf";
                if (string.IsNullOrEmpty(CrDiskFileDestinationOptions.DiskFileName) == false)
                {
                    CrExportOptions = cryRpt.ExportOptions;
                    {
                        CrExportOptions.ExportDestinationType = ExportDestinationType.DiskFile;
                        CrExportOptions.ExportFormatType = ExportFormatType.PortableDocFormat;
                        CrExportOptions.DestinationOptions = CrDiskFileDestinationOptions;
                        CrExportOptions.FormatOptions = CrFormatTypeOptions;
                    }
                    cryRpt.Export();
                }

        }
//To use the Report Viewer for showing the Crystal Report..

            DataSet DataNew = new DataSet();
            DataNew.ReadXml("F:\\LawrenceSoft\\VatDetails.xml");
            DataTable dtReportSource = (DataTable)DataNew.Tables[0];
            ReportDocument rdSample = new ReportDocument();

            rdSample.Load("C:\\LawrenceSoft\\Sample.rpt");
            rdSample.SetDataSource(dtReportSource);
            crystalReportViewer1.Visible = true;
            crystalReportViewer1.ReportSource = rdSample;
            crystalReportViewer1.Refresh();