How to Export pdf to excel

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CrystalReports

I have used these code to get the crystal report in pdf. Now I need to display it to Excel. I have not used report viewer.Thanks in advance.

ReportDocument rptDoc = new ReportDocument();
MemoryStream oStream = default(MemoryStream);
oStream=(MemoryStream)rptDoc.ExportToStream(CrystalDecisions.Shared.ExportFormatType.PortableDocFormat);
HttpContext.Current.Response.Clear();
HttpContext.Current.Response.Buffer = true;
HttpContext.Current.Response.ContentType = "application/pdf";
HttpContext.Current.Response.BinaryWrite(oStream.ToArray());
HttpContext.Current.Response.End();
rptDoc.Close();
rptDoc.Dispose();