Solved: asp.net c#, session variable

The following code at line 3 produces an error.

if (HttpContext.Current.Session.ContainsKey("MySettings"))

Question: How can I correct my code?

Error: 'System.Web.SessionState.HttpSessionState' does not contain a definition for 'ContainsKey' and no extension method 'ContainsKey' accepting a first argument of type 'System.Web.SessionState.HttpSessionState' could be found (are you missing a using directive or an assembly reference?)

Dictionary<string, string> settings = new Dictionary<string, string>();

 protected void Page_Load(object sender, EventArgs e)
{
            if (HttpContext.Current.Session.ContainsKey("MySettings"))
        {
            //HttpContext.Current.Session.Add("MySettings", settings);  // this line used elsewhere

            // store back settngs from last session
            settings = HttpContext.Current.Session["MySettings"] as Dictionary<string, string>;
        }
        else
        {
            upsdateSettings(listBoxes, "initialize"); // settings object gets initialized
        }

        if (IsPostBack)

        {
 
        }
        else
        {

        }
    }

Open in new window

FYI, I have located part of this code on the web. The declaration was like:

Dictionary<string, List<int>> settings = new Dictionary<string, List<int>>();

Could be this why I am getting this error? I have changed List<int> to string.

private void upsdateSettings(Dictionary<string, bool> listBoxes, string intilaizeOrSessionVariables) { //FYI, intilaizeOrSessionVariables is not used, will be deleted. settings.Clear(); //??? is this necessary foreach (string box in (from listBox in listBoxes where listBox.Value select listBox.Key)) { ListBox lb = new ListBox() { ID = "lst" + box }; settings.Add(box.ToString(), "-All-"); } }