of the method that USES session in ashx gets the session value

WEB development makes it easy to get Request and Response objects in general handler 1, such as:

HttpRequest _request = context.Request; 
HttpResponse _response = context.Response;

But it's not that easy to get the value of Session.

For example, if you want to get the login user information saved in Session Session["LoginUser"]

If you use context.Session ["LoginUser"] only, you will report an exception that says "no object reference was set to an instance of the object"!

Specifically, the following methods should be used:

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.SessionState;
namespace DtlCalendar.Mobile.Site.Manage
{
    /// <summary>
    /// DelApk  Summary description of 
    /// </summary>
    public class DelApk : IHttpHandler, IReadOnlySessionState
    {
        // IReadOnlySessionState : Read-only access Session
        // IRequiresSessionState : Read and write access Session
        public void ProcessRequest(HttpContext context)
        {
            string strID = context.Request["id"];
            context.Response.Clear();
            context.Response.ContentType = "text/plain";
            int id;
            string user;
            if (int.TryParse(strID, out id) && IsLoged(context, out user))
            {
                string reslt = DataProvider.MobileDataProvider.CreateInstance().DelMApk(id).ToString();
                BLL.LogOprHelper.Instance.InsertMLog(user, BLL.LogOpr.Delete, "DelApk result:" + reslt);
                context.Response.Write(reslt);
            }
            else
            {
                BLL.LogOprHelper.Instance.InsertMLog(strID, BLL.LogOpr.Delete, "DelApk result:-1");
                context.Response.Write("-1");
            }
        }
        private bool IsLoged(HttpContext context, out string user)
        {
            BLL.User _User;
            if (context.Session["LoginUser"] != null)
            {
                _User = context.Session["LoginUser"] as BLL.User;
                if (_User != null)
                {
                    user = _User.Account;
                    return true;
                }
            }
            user = string.Empty;
            return false;
        }
        public bool IsReusable
        {
            get
            {
                return true;
            }
        }
    }
}