Retriving radiobutton list from session

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Retriving radiobutton list selection from session. I have a radiobutton list. I want to have what I selected when I return to the page. The radiobutton list is filled from a array of strings 

Adding selection to the session 

  Session["selection"] = RadioButtonList1.SelectedIndex;
page load 
                    if (!IsPostBack)
                    RadioButtonList1.SelectedIndex = (string)Session["selection"];

Not working not sure why

  1. Post:194

    Re: Retriving radiobutton list from session

    ListControl.SelectedIndex Property

    Gets or sets the lowest ordinal index of the selected items in the list.

    Try This:

    RadioButtonList1.SelectedIndex = Convert.ToInt32(Session["selection"]);