Display/Store and Retrieve Image Data from Database to Gridview, and also on Mouse Over

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

using System;
using System.IO;
using System.Web;
public class Handler : IHttpHandler
{

    public bool IsReusable
    {
        get
        {
            return true;
        }
    }

    public void ProcessRequest(HttpContext context)
    {
        // Set up the response settings
        context.Response.ContentType = "image/jpeg";
        context.Response.Cache.SetCacheability(HttpCacheability.Public);
        context.Response.BufferOutput = false;

        // Setup the PhotoID Parameter
        //Int32 id = -1;
        //var xx = Session["ImageThumb"];
        Stream stream = null;
        //new MemoryStream((byte[])xx);  
        
        // Get the photo from the database, if nothing is returned, 
        
        // Write image stream to the response stream
        const int buffersize = 1024 * 16;
        byte[] buffer = new byte[buffersize];
        int count = stream.Read(buffer, 0, buffersize);
        while (count > 0)
        {
            context.Response.OutputStream.Write(buffer, 0, count);
            count = stream.Read(buffer, 0, buffersize);
        }
    }

}