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();