Silverlight Database Deep Zoom

<%@ WebHandler Language="C#" Class="TileHandler" %>
// 
// This source code is licensed for commercial and non-commercial use under the 
// Code Project Open License (CPOL) 1.02  http://www.codeproject.com/info/cpol10.aspx
// Developer: Joerg Lang (lang.joerg@gmail.com)
//  
using System;
using System.Data.OleDb;
using System.Diagnostics;
using System.Drawing;
using System.IO;
using System.Runtime.Serialization.Formatters.Binary;
using System.Web;
using DbDzComposer;

public class TileHandler : IHttpHandler
{

    public void ProcessRequest(HttpContext context)
    {

        if (context.Request.QueryString.HasKeys())
        {
            // Being lazy...
            int imageId = int.Parse(context.Request.QueryString.Get("imageId"));
            int tileLevel = int.Parse(context.Request.QueryString.Get("tileLevel"));
            int tilePosX = int.Parse(context.Request.QueryString.Get("tilePositionX"));
            int tilePosY = int.Parse(context.Request.QueryString.Get("tilePositionY"));
            string contentType = context.Request.QueryString.Get("contentType");

            context.Response.ContentType = contentType;
            System.Drawing.Bitmap bitmap = GetTile(imageId, tileLevel, tilePosX, tilePosY);


            if (bitmap != null)
            {
                System.IO.MemoryStream ms = new System.IO.MemoryStream();
                if (contentType.Contains("png"))
                    bitmap.Save(ms, System.Drawing.Imaging.ImageFormat.Png);
                else
                    bitmap.Save(ms, System.Drawing.Imaging.ImageFormat.Jpeg);
                ms.WriteTo(context.Response.OutputStream);
            }
        }
    }

    /// <summary>
    /// Returns a tile from the database
    /// </summary>
    /// <param name="imageId">The id of the image</param>
    /// <param name="level">The requested level</param>
    /// <param name="x">The x coordinate</param>
    /// <param name="y">The y coordinate</param>
    /// <returns></returns>
    private Bitmap GetTile(int imageId, int level, int x, int y)
    {
        try
        {
            DzDbAccess accessDb = DeepZoomSilverlightWeb.Helper.GetAccessDb();
            Bitmap bmp = accessDb.GetImageTile(imageId, level, x, y);
            accessDb.DbConnection.Close();
            return bmp;
        }
        catch (Exception)
        {
            return null;
        }

    }

    /// <summary>
    /// Return true if the handler should stay in memory.
    /// </summary>
    public bool IsReusable
    {
        get
        {
            // To enable pooling, return true here.
            // This keeps the handler in memory.
            return true;
        }
    }



}