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@{
    List<string> rules = new List<string>();
    Session["rules"] = rules;

    rules.Add("You do not talk about FIGHT CLUB.");
    rules.Add("You DO NOT talk about FIGHT CLUB.");
    rules.Add("If someone says \"stop\" or goes limp, taps out the fight is over.");
    //Session.Add("rules", "You do not talk about FIGHT CLUB.");
    //Session.Add("rules", "You DO NOT talk about FIGHT CLUB.");
    //Session.Add("rules", "If someone says \"stop\" or goes limp, taps out the fight is over.");

    if (Request.Form["rule"] != null && Request.Form["rule"].Length > 0)
    {
        //rules.Add(Request.Form["rule"]);
        //rules = (List<string>)Session["var"];
        HttpContext.Current.Session.Add("rule", Request.Form["rule"]);

    }

    }

        <!DOCTYPE html>
        <html>
        <head>
            <title></title>
        </head>
        <body>
            <form action="" method="post">
                Add rule: <input type="text" name="rule"><br>
                <input type="submit" value="Submit">
            </form>
            <ul>
                @foreach (string rule in rules)
                {
                    <li>@rule</li>
                }
            </ul>
        </body>
    </html>