How to export Asp.Net page to Pdf

I use the Winnovative.WnvHtmlConvert;

You can find it and download the wnvhtmlconvert.dll.
Make reference to the dll.
It is not free but it has demo version with a license. Get it from the site: http://www.winnovative-software.com/[^]
Use the following function:

/// <summary>
    /// Convert the HTML code from the specified URL to a PDF document and send the
    /// document as an attachment to the browser
    /// </summary>
    private void ConvertURLToPDF()
    {

        // Create the PDF converter. Optionally you can specify the virtual browser
        // width as parameter. 1024 pixels is default, 0 means autodetect
        PdfConverter pdfConverter = new PdfConverter();

        // set the license key - required
        pdfConverter.LicenseKey = "you license here";

        // set the converter options - optional
        pdfConverter.PdfDocumentOptions.PdfPageSize = PdfPageSize.A4;
        pdfConverter.PdfDocumentOptions.PdfCompressionLevel = PdfCompressionLevel.Normal;
        pdfConverter.PdfDocumentOptions.PdfPageOrientation = PDFPageOrientation.Portrait;


        // set if header and footer are shown in the PDF - optional - default is false
        pdfConverter.PdfDocumentOptions.ShowHeader = false;
        pdfConverter.PdfDocumentOptions.ShowFooter = false;
        // set to generate a pdf with selectable text or a pdf with embedded image - optional - default is true
        pdfConverter.PdfDocumentOptions.GenerateSelectablePdf = true;
        // set if the HTML content is resized if necessary to fit the PDF page width - optional - default is true
        pdfConverter.PdfDocumentOptions.FitWidth = true;
        //
        // set the embedded fonts option - optional - default is false
        pdfConverter.PdfDocumentOptions.EmbedFonts = false;
        // set the live HTTP links option - optional - default is true
        pdfConverter.PdfDocumentOptions.LiveUrlsEnabled = true;

        if (true) //(radioConvertToSelectablePDF.Checked)
        {
            // set if the JavaScript is enabled during conversion to a PDF with selectable text
            // - optional - default is false
            pdfConverter.ScriptsEnabled = false;
            // set if the ActiveX controls (like Flash player) are enabled during conversion
            // to a PDF with selectable text - optional - default is false
            pdfConverter.ActiveXEnabled = false;
        }
        else
        {
            // set if the JavaScript is enabled during conversion to a PDF with embedded image
            // - optional - default is true
            pdfConverter.ScriptsEnabledInImage = true;
            // set if the ActiveX controls (like Flash player) are enabled during conversion
            // to a PDF with embedded image - optional - default is true
            pdfConverter.ActiveXEnabledInImage = true;
        }

        // set if the images in PDF are compressed with JPEG to reduce the PDF document size - optional - default is true
        pdfConverter.PdfDocumentOptions.JpegCompressionEnabled = true;

        // enable auto-generated bookmarks for a specified list of tags (e.g. H1 and H2)
        if (false)
        {
            pdfConverter.PdfBookmarkOptions.TagNames = new string[] { "H1", "H2" };
        }

        // set PDF security options - optional
        //pdfConverter.PdfSecurityOptions.CanPrint = true;
        //pdfConverter.PdfSecurityOptions.CanEditContent = true;
        //pdfConverter.PdfSecurityOptions.UserPassword = "";

        //set PDF document description - optional
        //pdfConverter.PdfDocumentInfo.AuthorName = "Winnovative HTML to PDF Converter";

        //// add HTML header
        //if (cbAddHeader.Checked)
        //    AddHeader(pdfConverter);
        //// add HTML footer
        //if (cbAddFooter.Checked)
        //    AddFooter(pdfConverter);

        // Performs the conversion and get the pdf document bytes that you can further
        // save to a file or send as a browser response
        byte[] pdfBytes = pdfConverter.GetPdfBytesFromUrl(urlToConvert);

        // send the PDF document as a response to the browser for download
        System.Web.HttpResponse response = System.Web.HttpContext.Current.Response;
        response.Clear();
        response.AddHeader("Content-Type", "binary/octet-stream");
        response.AddHeader("Content-Disposition",
            "attachment; filename=ConversionResult.pdf; size=" + pdfBytes.Length.ToString());
        response.Flush();
        response.BinaryWrite(pdfBytes);
        response.Flush();
        response.End();
    }

Good luck.