making an image slideshow using database

<div>
        <div>
             <asp:ToolkitScriptManager ID="ToolkitScriptManager1" runat="server">
             </asp:ToolkitScriptManager>
             <asp:Image ID="img1" runat="server"
             Height="400px" Width="400px"
             ImageUrl="~/Image/2Desert.jpg" />
        </div>
        <asp:SlideShowExtender ID="SlideShowExtender1" runat="server"
BehaviorID="SSBehaviorID"
            TargetControlID="img1"
            SlideShowServiceMethod="GetSlides"
            AutoPlay="true"
            ImageDescriptionLabelID="lblDesc"
            NextButtonID="btnNext"
            PreviousButtonID="btnPrev"
            PlayButtonID="btnPlay"
            PlayButtonText="Play"
            StopButtonText="Stop"
            Loop="true" >
        </asp:SlideShowExtender>
    </div>
    </td>
    </tr>
    </table>
    </td>
    </tr>
    <tr>
    <td align="center" >
     <div>
            <asp:Label ID="lblDesc" runat="server" Text=""></asp:Label><br />
            <asp:Button ID="btnPrev" runat="server" Text="Previous" />
            <asp:Button ID="btnPlay" runat="server" Text="" />
            <asp:Button ID="btnNext" runat="server" Text="Next" />
        </div>
    </td>
    </tr>
    </table>
    </div>

Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load

    loadslide()

End Sub

Sub loadslide()

    con.ConnectionString = ConfigurationManager.ConnectionStrings("con").ConnectionString

    fselect = "select * from imgurl"

    sqlcmd = New SqlCommand(fselect, con)

    con.Open()

    sqladp = New SqlDataAdapter(sqlcmd)

    con.Close()

    dt1.Clear()

    sqladp.Fill(dt1)

End Sub

<system.web.services.webmethod(),>

       Public Shared Function GetSlides() As AjaxControlToolkit.Slide()

        Dim imgSlide As AjaxControlToolkit.Slide() = New AjaxControlToolkit.Slide(dt1.Rows.Count - 1) {}

        For i As Integer = 0 To dt1.Rows.Count - 1

            Dim dr As DataRow = dt1.Rows(i)

            imgSlide(i) = New AjaxControlToolkit.Slide(Replace(dr("ImageURL").ToString(), "~/", ""), "", "")

        Next

        Return (imgSlide)

    End Function