Crystal Report: export to html

Export to html or PDF or Excel file:

<code>

Private Sub Print(ByVal strRpt As String)
    Dim reportDoc As New ReportDocument
    lblDBErrorMessage.Text = ""
    Dim rpt_ds As DataSet = GetRptDS()
    If lblDBErrorMessage.Text <> "" Then
        Exit Sub
    End If
    reportDoc.Load(Server.MapPath("demorpt.rpt"))
    reportDoc.SetDataSource(rpt_ds)
    Select Case strRpt
    Case "HTML"
        Dim htmlformat As New HTMLFormatOptions
        reportDoc.ExportOptions.ExportDestinationType = ExportDestinationType.DiskFile
        reportDoc.ExportOptions.ExportFormatType = ExportFormatType.HTML40
        htmlformat.HTMLBaseFolderName = Server.MapPath("../printemp/")
        '放在/printemp/之下,它會自動產生demorpt資料夾
        '和其他的匯出不一樣要設定htmlformat
        htmlformat.HTMLFileName = "demo.htm"
        reportDoc.ExportOptions.FormatOptions = htmlformat
        reportDoc.Export()
        Dim htmurl As String = "../printemp/demorpt/demo.htm"
        Response.Redirect(htmurl)
    Case "PDF"
        Dim objFile As New DiskFileDestinationOptions
        reportDoc.ExportOptions.DestinationOptions = objFile
        objFile.DiskFileName = Server.MapPath("../printemp/demo.pdf")
        With reportDoc.ExportOptions
            .ExportDestinationType = ExportDestinationType.DiskFile
            .ExportFormatType = ExportFormatType.PortableDocFormat
            .DestinationOptions = objFile
        End With
        reportDoc.Export()
        Dim xlsurl As String = "../printemp/demo.pdf"
        Response.Redirect(xlsurl)
    Case "Excel"
        Dim objFile As New DiskFileDestinationOptions
        Dim CrFormatTypeOptions As New ExcelFormatOptions                       
        With CrFormatTypeOptions                                      
            .ExcelTabHasColumnHeadings = True                        
            .ExcelAreaType = AreaSectionKind.PageHeader              
            .ExcelUseConstantColumnWidth = False                   
        End With                                                       
        reportDoc.ExportOptions.DestinationOptions = objFile
        objFile.DiskFileName = Server.MapPath("../printemp/demo.xls")
        With reportDoc.ExportOptions
            .ExportDestinationType = ExportDestinationType.DiskFile
            .ExportFormatType = ExportFormatType.Excel
            .DestinationOptions = objFile
            .FormatOptions = CrFormatTypeOptions           
        End With
        reportDoc.Export()
        Dim xlsurl As String = "../printemp/demo.xls"
        Response.Redirect(xlsurl)
    End Select
End Sub

</code>