public class FileUpLoadHandler : IHttpHandler, IRequiresSessionState, IReadOnlySessionState
{
    
    public void ProcessRequest (HttpContext context) {
        context.Response.ContentType = "text/plain";
        //context.Request.Headers.Add("Connection","keep-alive");
        
        Request = context.Request;
        Response = context.Response;
        Response.Buffer = false;
        Response.BufferOutput = false;
        Server = context.Server;
        Session=context.Session;
        string pram=Request.QueryString["process"];
        if (pram != null)
        {
            if (pram == "true")
            {
                Request.ContentType = "text/plain";
                Response.ContentType = "text/plain";
                object process =Session["Process"];
                if (process != null)
                {
                    Response.Write((string)process);
                }
                else
                {
                    Response.Write("0");
                }
            }
        }
        else
        {
            UpLoadFiles();
        }
    }

    HttpRequest Request;
    HttpResponse Response;
    HttpServerUtility Server;
    HttpSessionState Session;