how to use HttpHandler correctly.

I created a class Library Handler

using System;
using System.Data;
using System.Web;
using System.Text;


interface IHttpHandler
{
    void ProcessRequest(HttpContext ctx);
    bool IsReusable{ get; }
}

namespace HelloWorld
{


    public class HttpHandler : IHttpHandler
    {
        public bool IsReusable
        {
            get
            {
                return true;
            }
        }

        public void Proces ...