Binding DropDownList with Dictionary

  Dictionary<string, string> states = new Dictionary<string, string>();
        states.Add("-1", "-Select State-");
        states.Add("AP", "Andhra Predesh");
        states.Add("KA", "Karnataka");
        states.Add("TN", "Tamilnadu");
        states.Add("KL", "Kerala");
        ddl1.DataSource = states;
        ddl1.DataValueField = "Key";
        ddl1.DataTextField = "Value";
        ddl1.DataBind();