How to link generic handler to business logic

 public List get_ballot()
       {
           csDAL objdal = new csDAL();
           List objlist = new List();
           IDataReader dr = null;
           dr = objdal.executespreturndr("get_ballot");
           while (dr.Read())
           {
               Ballot objc = new Ballot();
               populate_reader(dr, objc);
               objlist.Add(objc);
           }
           return objlist;
       }

       private void populate_reader(IDataReader objdr, Ballot objc)
       {
           objc.id = objdr.GetInt32(0);
           objc.imgName = objdr.GetString(1);
           objc.pic1 = (Byte[])objdr.GetValue(2);
           objc.pic2 = (Byte[])objdr.GetValue(3);
       }
    
}

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using BLL;

namespace SEARCH
{
    /// 

    /// Summary description for Grabimg
    /// 

    public class Grabimg : IHttpHandler
    {

        public void ProcessRequest(HttpContext context)
        {
            Int32 id;
            if (context.Request.QueryString["id"] != null) 
            {id=Convert.ToInt32 (context .Request .QueryString ["id"]);}
            else
            {throw new ArgumentException("No parameter specified");}
            context .Response .ContentType ="img/jpeg";
            System.IO.Stream strm = showImg(id);
            Byte[] buffer = new Byte[strm.Length];
            int bytesql = strm.Read(buffer, 0, buffer.Length);
            while (bytesql > 0) 
            {
                context.Response.OutputStream.Write(buffer, 0, bytesql);
                bytesql = strm.Read(buffer, 0, buffer.Length);
                strm.Close();
            }
           


            //public System .IO .Stream ShowImg(Int32 id)
            //{
            //BLL.Ballot objc=new BLL.Ballot ();
            //    objc.id=id;
            //    objc.imgName =
            //}
            //context.Response.ContentType = "text/plain";
            //context.Response.Write("Hello World");
        }

        public System .IO .Stream ShowImg(int id)
            {
            BLL.Ballot objc=new BLL.Ballot ();
            List obji = new List();
                obji.id=id;
                obji  = obji.get_ballot();

            }

        private System.IO.Stream showImg(int id)
        {
           throw new NotImplementedException();
        }

        public bool IsReusable
        {
            get
            {
                return false;
            }
        }
    }
}