I am coding a language learning module for my mojoportal-based iphone-optimized website (work in progress, english resources are not fully translated: http://ilearn.dandandin.it/kanatrainer.aspx)

It's a simple "guess how to read this" game, with the right answer stored in a Session object.

I don't understand why, but, expecially using Safari, users will get someone else's Session value

I tried to debug it, but this never happens to me, so I think that the Session object it's not the right approach. What do you suggest me to pass the variables between the postbacks?

An hidden field? A ViewState?

Otherwise I am thinking about storing that temporary data in the database, using the user guid as index. Is this a better approach? But, what about guests? Maybe I could restrict that module only to registered users.

I am puzzled, because when i debug in visual studio (also when debugging with iis), i try with multiple contemporaneous requests from different browsers, and this does not happen. I go live with IIS, and i get the exchange between the values.

I'll link the value to the userguid

This is an excerpt from the code (i removed some stuff, translated the variables)

        protected void Page_Load(object sender, EventArgs e)

        {

        if (!Page.IsPostBack)
            {
            ...
            generateRandom();
            }
        }

        protected void generateRandom()
        {
            int i, j = 0, livello = 5, chance = 0;
            System.Random acaso = new Random();
            ...
            while (j <= 0)
            {
                j = acaso.Next((Convert.ToInt32(TextBoxlunghezza.Text) + 1));
            }
            ...
            for (int k = 0; k < j; k++)
            {
                i = acaso.Next(livello);
                Session["randomLetters"] += (globals.asianCharacters[i]);
                ...
            }
            ...
        }

        protected void AnswerButton_Click(object sender, EventArgs e)
        {
            string compare = Server.HtmlEncode(InputTextBox.Text.ToLower());
            if (compare == "")
            {
                Label1.Text = ("You did not write anything");
                return;
            }
            if (Session["randomLetters"].ToString() != compare)
            {
                Label1.Text = ("Wrong!" + Session["randomLetters"]);
            }
            else
            {
                Label1.Text = ("Right!" + Session["randomLetters"]);
            }
         ...
        }

What happens in visual studio, with every browser:

randomLetters is "hello". User writes "hello" in the textbox, and "hello" is compared to "hello". Label says "Right! hello".

What happens in iis, only in webkit-based browsers:

randomLetters is "hello". User writes "hello" in the textbox, but "hello" is compared to "goodbye". Label says "Wrong! goodbye".

I don't understand how Session["randomLetters"] has changed