Sample Code VB.NET
Imports SelectPdf Imports System.Drawing Namespace Controllers Public Class WebElementsLocationController Inherits Controller ' GET: WebElementsLocation Function Index() As ActionResult Return View() End Function <HttpPost> Public Function SubmitAction(fields As FormCollection) As ActionResult ' instantiate a html to pdf converter object Dim converter As New HtmlToPdf() ' set the css selectors for the web elements ' whose positions will be retrieved converter.Options.WebElementsMappingOptions.CssSelectors = fields("TxtElements").Split(New Char() {","c}) ' create a new pdf document converting an url Dim doc As PdfDocument = converter.ConvertUrl(fields("TxtUrl")) ' get all web elements and mark/highlight them with a green rectangle For Each element As WebElement In converter.Options.WebElementsMappingOptions.Result ' each web element has several rendering rectangles ' (if it is displayed in more than 1 page) For Each webElementRectangle As WebElementPdfRectangle In element.PdfRectangles ' get the PDF page Dim page As PdfPage = doc.Pages(webElementRectangle.PageIndex) Dim rectangle As RectangleF = webElementRectangle.Rectangle ' highlight the HTML element Dim blueRectangle As New PdfRectangleElement( rectangle.X, rectangle.Y, rectangle.Width, rectangle.Height) blueRectangle.ForeColor = Color.Blue page.Add(blueRectangle) Next Next ' save pdf document Dim pdf As Byte() = doc.Save() ' close pdf document doc.Close() ' return resulted pdf document Dim fileResult As FileResult = New FileContentResult(pdf, "application/pdf") fileResult.FileDownloadName = "Document.pdf" Return fileResult End Function End Class End Namespace