global session

msomar · March 29th, 2010, 10:32 AM

I create session in Page load like:

Code:

protected void Page_Load(object sender, EventArgs e)
    {
        Session["text"] = Request.Form["text_ad"];
    }

and I need access to this session in the same page in Button1_Click like:

Code:

protected void Button1_Click(object sender, EventArgs e)
    {
       Response.Write(Session["text"]);
    }

But I cant access to the session.

samjudson · March 29th, 2010, 10:51 AM

Well what you have written would certainly work. However you are aware that Page_Load is called every time the page loads, including when a button is pressed. So its quite possible you are writing an empty string back into the session variable.

Use Page.IsPostBack to see if you are posting back or not, or do a check to see if Session has already been set perhaps?

joefawcett · March 29th, 2010, 11:04 AM

Seems a strange use case, given that if you have a form parameter that you retrieve on Page_Load you can also retrieve it in the click handler.
Anyway, the Session variable will be set every time the page loads and this occurs before the click handler, are you certain the text_ad is being sent every time?

Perhaps you need to only set the Session variable if it's not a postback?

msomar · March 29th, 2010, 11:22 AM

I dont understand what do you mean.
the session stored in Page_Load ()
and I need to access to this session when the Button1_Click() is clicked.
the Page_Load () and Button1_Click()
in the same page

samjudson · March 29th, 2010, 11:29 AM

When you first load the page, Page_Load is called.

Then when you press the button it reloads the page (called a 'PostBack').

This calls Page_Load, and then calls Button1_Click.

When Page_Load is called the first time I suspect Request.Form["text_ad"] returns something, and stores that in the session variable.

The second time however I suspect that Request.Form["text_ad"] will be empty, so overwrite the previously stored value in the session variable with an empty string.

Simples?