Hello,

I am writing an ASP.NET c# application.
I am assiging a session variable on an 'aspx' page, when the application starts:
Session["sessionid"] = Session.SessionID;

Then, I want to read it in a 'cs' file:
HttpContext.Current.Session["sessionid"].ToString()

But, HttpContext.Current is null.

I also tried: HttpContext.Current.Session.SessionID because what i need is the sessionID but, here too, HttpContext.Current is null.

How can i get the session value or the session id in the cs file?

Thanks,

Dana

You haven't disabled session or any other important http module in you web config?

Where is the .cs file?  Is it a code behind for a page, in the app_code directory, another project?  You should be able to access HttpContext.Current most anywhere in your web application.

I'm not sure you're able to access it from within an external assembly, but if the class i placed in App_Code then it should work.

Then, I want to read it in a 'cs' file:
HttpContext.Current.Session["sessionid"].ToString()

....... it seems like you are trying to access the HttpContext object from a assembly and not within the code in the web application. I am not sure if you can access this object from anywhere else except from the code sitting in its APP_CODE directory.

If you do need it; then probably its best to pass along the Page.Context as an argument to the function and use it from there.

No, I haven't disabled the session in my web.config

The class is located in the app_code directory of my project.

Hi danal,

In my opinion, it depends on how you invoke the corresponding method which defined in the separate class file. If the invoked method is running in the same thread of Page_Load, the HttpContext.Current shouldn’t be null. For example, the following code works on my machine.

    protected void Page_Load(object sender, EventArgs e)
    {
        Session["sessionid"] = "01233210";
        Class1 c1 = new Class1();
        Response.Write(c1.GetSessionID());
    }

***************** App_Code\Class1.cs *****************
        public string GetSessionID()
        {
            return HttpContext.Current.Session["sessionid"].ToString();
        }

If that method is running in the different thread, you should pass a reference like “naimulah” said. For more informatin, please refer to the following link. Hope it is helpful to you.

Working With HttpContext.Current
http://www.odetocode.com/Articles/112.aspx