Problem with ajax Rating

<cc1:Rating ID="ItemRating" runat="server"
            CurrentRating="4"
            MaxRating="5"
            StarCssClass="ratingStar"
            WaitingStarCssClass="savedRatingStar"
            FilledStarCssClass="filledRatingStar"
            EmptyStarCssClass="emptyRatingStar"
            AutoPostBack="true"
            Tag="10"
            OnChanged="Rating_Changed" />

protected void Rating_Changed(object sender, AjaxControlToolkit.RatingEventArgs e)
 {
     LblRating.Text = "Rated " + DRow[3].ToString() + " by " + DRow[4].ToString() + " People and your Rating is " + e.Value;
 }