using System;
using System.Data;
using System.Configuration;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
using Bytescout.Watermarking;
using Bytescout.Watermarking.Presets;

public partial class _Default : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{

// Create Watermarker instance
Watermarker waterMarker = new Watermarker();

// Initialize library
waterMarker.InitLibrary("demo", "demo");

// Set input file name
string inputFilePath = "my_sample_image.jpg";

// Add image to apply watermarks to
waterMarker.AddInputFile(inputFilePath);

// Create new watermark
TextFitsPage preset = new TextFitsPage();

// Set watermark text
preset.Text = "Bytescout Watermarking";

// Add watermark to watermarker
waterMarker.AddWatermark(preset);

// clear http output
Response.Clear();
// set the content type to JPEG
Response.ContentType = "image/jpeg";
// add content type header
Response.AddHeader("Content-Type", "image/jpeg");
// set the content disposition
Response.AddHeader("Content-Disposition", "inline;filename=my_sample_image.jpg");
// Set output directory
waterMarker.OutputOptions.OutputStream = Response.OutputStream;
// Apply watermarks
waterMarker.Execute(0);

Response.End();
}
}

Download source code: watermarkingsdk_asp_net.zip (240 KB)

You can also use EXIF macros to watermark images with their extended information. See this sample to view tutorial