Converting Asp.net Webpage to PDF using Itextsharp

Question

I get the below error while converting asp.net webpage to pdf Script control 'UpdateProgress1' is not a registered script control. Script controls must be registered using RegisterScriptControl() before calling RegisterScriptDescriptors(). Code behind file as below: protected void btnExport_Click(object sender EventArgs e) { Response.ContentType = application/pdf; Response.AddHeader(content-disposition attachment;filename=TestPage.pdf); Response.Cache.SetCacheability(HttpCacheability.NoCache); StringWriter sw = new StringWriter(); HtmlTextWriter hw = new HtmlTextWriter(sw); this.Page.RenderControl(hw);(Exception occurs here) StringReader sr = new StringReader(sw.ToString()); Document pdfDoc = new Document(PageSize.A4 10f 10f 100f 0f); HTMLWorker htmlparser = new HTMLWorker(pdfDoc); PdfWriter.GetInstance(pdfDoc Response.OutputStream); pdfDoc.Open(); htmlparser.Parse(sr); pdfDoc.Close(); Response.Write(pdfDoc); Response.End(); } Attached the codebehind and aspx pages. Request you to help me in finding the sloution Thanks and Regards Santosh Kumar

Manav Pandya · Answer

Hello Type following line in OnPrerender method : base .OnPreRender(e); It may occur also if scriptmanager is not placed properly : Add scriptmanager in oninit event of webpart Thanks

Manav Pandya · Answer

Hello Try to put inside button click event if possible Thanks

Manav Pandya · Answer

Hello You can write this within pageload event  so that it will register before you use it Thanks

Manav Pandya · Answer

Hello Following code working for me : ScriptManager sm = ScriptManager.GetCurrent(Page); sm.RegisterScriptControl(control_name); Than make it visible : control_name.Visible = true ; Thanks

Leon D · Answer

You can try to use Spire.Doc to convert aspx page to pdf. The code is like the following: Document document = new Document(); using (MemoryStream buffer = new MemoryStream()) { using (TextWriter writer = new StreamWriter(buffer Encoding.UTF8)) { using (HtmlTextWriter htmlWriter = new HtmlTextWriter(writer)) { this .RenderControl(htmlWriter); htmlWriter.Flush(); writer.Flush(); buffer.Position = 0; string stylesheet = Default.css ; using (StreamReader reader = new System.IO.StreamReader(buffer Encoding.UTF8)) { String baseHref = Request.Url.AbsoluteUri; document.LoadHTML(reader baseHref Spire.Doc.Documents.XHTMLValidationType.None); document.HtmlExportOptions.CssStyleSheetType = CssStyleSheetType.External; document.HtmlExportOptions.CssStyleSheetFileName = stylesheet; document.SaveToFile( Test.pdf  Spire.Doc.FileFormat.PDF Response HttpContentType.Attachment); } } } }

santosh kumar · Answer

Hi Manav Done the changes as you mentioned but still getting the same error. Thanks

santosh kumar · Answer

Hi Manav Yes even tried by keeping these 3 lines of code in button_click event. But still getting the same error ScriptControl UpdateProgress1 is not registered. Thanks

santosh kumar · Answer

Hi Manav When I add the below three lines in page_load event ScriptManager sm = ScriptManager.GetCurrent(Page); sm.RegisterScriptControl(UpdateProgress1); UpdateProgress1.Visible = true; I am getting the below error Script controls may not be registered before PreRender. So added it under OnPrerender event but then the same error UpdateProgress1 Control is not registered error comming. Am i missing any thing. If possible please check my code behind and aspx pages attached to this post Thanks

santosh kumar · Answer

Hi Manav Where exactly i need to add these 2 lines of code . Do i need to add these lines in button_click functionality of my .cs file? Thanks