Hide parameters of URL and display Root folder

Hi,

    i have designed crystal report for adding digital signature,  below my code for exporting and opening PDF code.

                pdfFilename = Company_Code & "_" & Segment_Code & "_" & house_no & "_" & Now.Millisecond & ".PDF"

                pdfFile = Server.MapPath("~/SourceFolder/" & pdfFilename)

                rpt.ExportToDisk(ExportFormatType.PortableDocFormat, pdfFile)

                 System.Threading.Thread.Sleep(10000)

                Response.ContentType = "application/pdf"

                Response.TransmitFile(Server.MapPath("~/DestinationFolder/" & pdfFilename))

My Query:

               after exporting and adding signature my URL like  this

http://59.14.144.21/EFSReports/CR_FSL_BL.aspx?company_code=FSL&branch_code=IN&location_code=11206

but i want to display my URL like below,

http://59.14.144.21/EFSReports/DestinationFolder/INXP_01_120130000699_765.PDF

how can i hide URL and display my pdf root file name... ?

thanks in advance.