If I host an ASP.NET page with: <%@ Page Language=C# %> <!DOCTYPE html> <script

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Asked: May 22, 20262026-05-22T20:09:42+00:00 2026-05-22T20:09:42+00:00

If I host an ASP.NET page with: <%@ Page Language=C# %> <!DOCTYPE html> <script

0

If I host an ASP.NET page with:

<%@ Page Language="C#" %>
<!DOCTYPE html>
<script runat="server">

    protected void btn_Click(object sender, EventArgs e)
    {
        lbl.Text = HttpContext.Current.Session["a"] == null ? 
                      "null" : 
                      HttpContext.Current.Session["a"].ToString();
    }
    protected void btn_Click2(object sender, EventArgs e)
    {
        lbl.Text = HttpContext.Current.Cache["a"] == null ? 
                      "null" : 
                      HttpContext.Current.Cache["a"].ToString();
    }

    protected void Page_Load(object sender, EventArgs e)
    {
        if (!Page.IsPostBack)
        {
            HttpContext.Current.Session["a"] = "CBA";
            lbl.Text = "assigned Session Variable";

            HttpContext.Current.Cache.Add(
                    "a", "ABC", null, 
                    DateTime.Now.AddHours(2), TimeSpan.Zero, 
                    CacheItemPriority.NotRemovable, null);
        }
    }

</script>

<html>
<head>
    <title>Testing Session</title>
</head>
<body>
    <form id="form1" runat="server">
    <div>
        <asp:Button ID="btn" runat="server" Text="read Session" OnClick="btn_Click" />&nbsp;&nbsp;
        <asp:Button ID="btn2" runat="server" Text="read Cache" OnClick="btn_Click2" />
        <hr />
        <asp:Label ID="lbl" runat="server" />
    </div>
    </form>
</body>
</html>

on the first run I do get the assigned Session Variable text, but upon click the Session object is always null

Id there an option I need to turn on/off to use the normal Session Variables ?

works fine on IIS 6.0 and Cassini (under VS 2008 and 2010).