Slideshow multiple images from database

<asp:ScriptManager ID="ScriptManger1" runat="Server">
    </asp:ScriptManager>
    <div>
        <asp:Timer runat="server" Interval="10000" ID="SlideShowTimer" OnTick="SlideShowTimer_Tick" />
        <asp:UpdatePanel runat="server" ID="SlideShow" UpdateMode="Conditional">
            <ContentTemplate>
                <asp:Image runat="Server" ID="SlideShowImage1" ImageUrl="" Width="100%" Height="150px" />
                <asp:AdRotator ID="AdRotator1" runat="Server" />
            </ContentTemplate>
            <Triggers>
                <asp:AsyncPostBackTrigger ControlID="SlideShowTimer" EventName="Tick" />
            </Triggers>
        </asp:UpdatePanel>

        <asp:UpdatePanelAnimationExtender ID="UPextender" runat="server" TargetControlID="SlideShow"
            BehaviorID="animation" >
            <Animations>
                <OnUpdating>
                     <%-- It should take 1/2 of a second to fade out --%>
                        <FadeOut Duration=".5" Fps="20" minimumOpacity=".1" />
                </OnUpdating>
                <OnUpdated>
                     <%-- It should take 1 and 1/2 of a second to fade back in --%>
                     <FadeIn Duration="1.5" Fps="20" minimumOpacity=".1" />
                </OnUpdated>
            </Animations>
        </asp:UpdatePanelAnimationExtender>
    </div>

C# code

//import following namespaces

using System.Data;
using System.Data.SqlClient;

protected void Page_Load(object sender, EventArgs e)
{
if (!IsPostBack)
{

AdRotator1.DataSource = FetchAdsFromDB();
AdRotator1.DataBind();

}
}
protected void SlideShowTimer_Tick(object sender, EventArgs e)
{
AdRotator1.DataSource = FetchAdsFromDB();
AdRotator1.DataBind();

}
private DataTable FetchAdsFromDB()
{
DataTable dt = new DataTable();
SqlDataAdapter da = new SqlDataAdapter("select AlternateText,ImageUrl,NavigateUrl,Impressions from imageadrotator", con);
da.Fill(dt);
return dt;
//ImageUrl must be needed[image location from db]

}
}