handler.ashx

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<%@ WebHandler Language="C#" Class="Handler" %>

using System;
using System.Web;
using System.Drawing;
using System.Drawing.Imaging;
using System.IO;

public class Handler : IHttpHandler
{
    private string WATERMARK_URL = "~/Images/Users/WaterMark.png";
    private string DEFAULTIMAGE_URL = "~/Images/Users/noperson.jpg";

    public void ProcessRequest(HttpContext context)
    {
        String ImagePath = context.Server.MapPath( context.Request["URL"]);
        Image Cover = null;
        if (File.Exists(ImagePath))
        {
            Cover = Image.FromFile(ImagePath);
            Image Water = Image.FromFile(context.Server.MapPath(WATERMARK_URL));
            Graphics G = Graphics.FromImage(Cover);
            G.DrawImage(Water, new Rectangle(Cover.Width - Water.Width, Cover.Height - Water.Height, Water.Width, Water.Height), 0, 0, Water.Width, Water.Height, GraphicsUnit.Pixel);
            G.Dispose();
            Water.Dispose();
        }
        else
        {
            Cover = Image.FromFile(context.Server.MapPath(DEFAULTIMAGE_URL));
        }
        context.Response.ContentType = "image/jpeg";
        Cover.Save(context.Response.OutputStream, System.Drawing.Imaging.ImageFormat.Jpeg);
        Cover.Dispose();
    }

    public bool IsReusable
    {
        get
        {
            return false;
        }
    }

}