Need Help! No data when I export my crystal report into pdf file

Guys,

Can you help me how to debug my codes, I was stuck and i can't find the error why there's no data appeared when i export on pdf file.

DSData as my DATASET
DTR_Report as my Crystal REport

here's my code:

DataOpen()
        cmd.CommandText = "Select BIOID, afpsn, Dept, Lname, Fname, CONVERT(char(10), date, 101)Date, Day, AM_IN, AM_OUT, PM_IN, PM_OUT, OT_IN, OT_OUT, DeptHead, DeptPost, TimeLate from AllDTR where BIOID = '" & users & "' AND Date > '08/31/2009' ORDER BY Date"
        da = New SqlClient.SqlDataAdapter(cmd.CommandText, cmd.Connection)
        ds = New DSDTR
        da.Fill(ds, "PrintDTR")
        cmd.Connection.Close()
        Dim rpt As New ReportDocument
        rpt.Load(Server.MapPath("CrystalReports/DTR_Report.rpt"))
        rpt.SetDataSource(ds)
        Dim expOption As ExportOptions
        Dim destination As DiskFileDestinationOptions
        Dim Fname As String
        Fname = Server.MapPath("App_Data/Temp/" & Session.SessionID.ToString & ".pdf")
        destination = New DiskFileDestinationOptions()
        destination.DiskFileName = Fname
        expOption = rpt.ExportOptions
        With expOption
            .DestinationOptions = destination
            .ExportDestinationType = ExportDestinationType.DiskFile
            .ExportFormatType = ExportFormatType.PortableDocFormat
        End With
        rpt.Export()
        Response.ClearContent()
        Response.ClearHeaders()
        Response.ContentType = "application/pdf"
        Response.WriteFile(Fname)
        Response.Flush()
        Response.Close()
        System.IO.File.Delete(Fname)