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

using System;
using System.Web;
using System.IO;
using System.Data;
using System.Data.SqlClient;
using System.Configuration;

public class ShowImage : IHttpHandler {

    public void ProcessRequest(HttpContext context)
    {
        try
        {
            Int32 picid;
            if (context.Request.QueryString["id"] != null)
            {
                picid = Convert.ToInt32(context.Request.QueryString["id"]);
            }
            else
            {
                return;
                throw new ArgumentException("No parameter specified");
            }
            context.Response.ContentType = "image/jpeg";
            Stream strm = ShowAlbumImage(picid);
            byte[] buffer = new byte[4096];
            int byteSeq = strm.Read(buffer, 0, 4096);
            while (byteSeq > 0)
            {
                context.Response.OutputStream.Write(buffer, 0, byteSeq);
                byteSeq = strm.Read(buffer, 0, 4096);
            }
        }
        catch { }
    }

    public Stream ShowAlbumImage(int picid)
    {
        string conn = ConfigurationManager.ConnectionStrings["ApplicationServices"].ConnectionString;
        SqlConnection connection = new SqlConnection(conn);
        string sql = "SELECT pic FROM Photo WHERE id = @id";
        SqlCommand cmd = new SqlCommand(sql, connection);
        cmd.CommandType = CommandType.Text;
        cmd.Parameters.AddWithValue("@id", picid);
        connection.Open();
        object img = cmd.ExecuteScalar();
        try
        {
            return new MemoryStream((byte[])img);
        }
        catch
        {
            return null;
        }
        finally
        {
            connection.Close();
        }
    }

    public bool IsReusable
    {
        get
        {
            return false;
        }
    }

}

<ItemTemplate>
                   <a href='<%# "ShowImage.ashx?id=" + Eval("id") %>' rel="" title="">                                
                                    <img src='<%# "ShowImage.ashx?id=" + Eval("id") %>' width="110" height="110" alt='<%# Eval("title") %>' />
                             </a>
                </ItemTemplate>