SelectPdf for .NET - Pdf Watermarks

This sample shows how to create a new PDF document using SelectPdf, how to add several pages and watermark all the pages with a transparent image in the background.

Pdf watermarks are done using pdf templates that contain elements that repeat on each page of the pdf document.

Sample Code C#

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using SelectPdf;

namespace SelectPdf.Samples
{
    public partial class pdf_watermarks : System.Web.UI.Page
    {
        protected void BtnCreatePdf_Click(object sender, EventArgs e)
        {
            // create a new pdf document
            PdfDocument doc = new PdfDocument();

            // create a new pdf font
            PdfFont font = doc.AddFont(PdfStandardFont.Helvetica);
            font.Size = 24;

            // add a new page to the document
            PdfPage page = doc.AddPage();

            // create a new text element and add it to the page
            PdfTextElement text = new PdfTextElement(0, 0, Helper.SomeLongText(), font);
            page.Add(text);

            // get image path
            string imgFile = Server.MapPath("~/files/logo.png");

            // watermark all pages - add a template containing an image 
            // to the bottom right of the page
            // the image should repeat on all pdf pages automatically
            // the template should be rendered behind the rest of the page elements
            PdfTemplate template = doc.AddTemplate(doc.Pages[0].ClientRectangle);
            PdfImageElement img = new PdfImageElement(
                doc.Pages[0].ClientRectangle.Width - 300, 
                doc.Pages[0].ClientRectangle.Height - 150, imgFile);
            img.Transparency = 50;
            template.Background = true;
            template.Add(img);

            // save pdf document
            doc.Save(Response, false, "Sample.pdf");

            // close pdf document
            doc.Close();
        }
    }
}