unable to validate page on w3c which is using asp.net imagerotator

Below is my web user control

<%@ Control Language="C#" AutoEventWireup="true" CodeFile="ImageRotator.ascx.cs" Inherits="ImageRotator" %>
<%@ Register Assembly="AjaxControlToolkit" Namespace="AjaxControlToolkit" TagPrefix="asp" %>

    <form id="form1" runat="server">
    <asp:ScriptManager ID="ScriptManager1" runat="server">
    </asp:ScriptManager>
    <asp:UpdatePanel ID="UpdatePanel1" runat="server">
        <ContentTemplate>
            <div>
                <div style="margin-top:1.5em;">
                 
                    <asp:Image ID="Image1" runat="server" Height="550" Width="550" alt="" Style="float:left; margin-left:2em;" /><br />
                    <br />
                    <asp:Label ID="lblImageDescription" runat="server" /><br />
                   <div style="margin:9em; float:left; margin: 0em 5em 0em 5em;">
                   <br />
                   <div style="margin-left:175px;">
                       <asp:ImageButton ID="Btn_Previous" runat="server" ImageUrl="../images/BACK-ARROW.png" Height=30 alt="Previous" style="text-align:center;"  /> 

                         <asp:ImageButton ID="Btn_Play" runat="server" ImageUrl="../images/pause.png" Height=28 alt="Play" style="padding-left:1em;text-align:center;"  /> 


                       <asp:ImageButton ID="Btn_Next" runat="server" ImageUrl="../images/FRONT-ARROW.png" alt="Next" Height=30 style="padding-left:1em;" />

                       </div>
                   <%-- <asp:Button ID="Btn_Previous" runat="server" Text="Previous" />
                    <asp:Button ID="Btn_Next"  runat="server" Text="Next" Width="64px" />--%>
                    <%--<asp:Button ID="Btn_Play" runat="server" Text="Play" ForeColor=White /><br />--%>
                    <asp:SlideShowExtender ID="SlideShowExtender1" AutoPlay="true" ImageDescriptionLabelID="lblImageDescription"
                        Loop="true" NextButtonID="Btn_Next" PlayButtonID="Btn_Play" PlayButtonText="Play" 
                        SlideShowServicePath="~/WebService.asmx" PreviousButtonID="Btn_Previous" SlideShowServiceMethod="GetSlides"
                        StopButtonText="Stop" TargetControlID="Image1" runat="server">
                    </asp:SlideShowExtender>

                    </div>
                     </div> </div>
        </ContentTemplate>
    </asp:UpdatePanel>
   
    </form>

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I m unable to validate the page http://nkarch.lifeintheuktest.co/the-practice.aspx

and getting the error

"Line 47, Column 156: Bad value for attribute src on element img: Must be non-empty."

mmalik15Asked: 2013-01-13

Who is Participating?

LVL 21

masterpassCommented: 2013-01-13

Can yo update this

<asp:Image ID="Image1" runat="server" src="Images/SliderImages/Lama%20Island%20HK.jpg" Height="550" Width="550" alt="" Style="float:left; margin-left:2em;" />

to

<asp:Image ID="Image1" runat="server" ImageUrl="Images/SliderImages/Lama%20Island%20HK.jpg" Height="550" Width="550" alt="" Style="float:left; margin-left:2em;" />

Hope this helps

LVL 84

Dave BaldwinFixer of ProblemsCommented: 2013-01-13

So put the file name of your first image in there. In your actual page, it will be replaced almost immediately.

mmalik15Author Commented: 2013-01-13

thanks for the comment. I have tried setting up the src value and give it path of the first image but now i get a different validation error

" Line 47, Column 138: Duplicate attribute src."

http://validator.w3.org/check?uri=http%3A%2F%2Fnkarch.lifeintheuktest.co%2Fthe-practice.aspx&charset=%28detect+automatically%29&doctype=Inline&group=0&user-agent=W3C_Validator%2F1.3

LVL 84

Dave BaldwinFixer of ProblemsCommented: 2013-01-13

I meant you should put the file name in the existing 'src' attribute, not to add another 'src' attribute.

mmalik15Author Commented: 2013-01-13

ermm i have only one image control and this is how i have specified it

<asp:Image ID="Image1" runat="server" src="Images/SliderImages/Lama%20Island%20HK.jpg" Height="550" Width="550" alt="" Style="float:left; margin-left:2em;" />

where else is the existing src?

LVL 84

Dave BaldwinFixer of ProblemsCommented: 2013-01-13

It shows in your "View Source" of that section so something is putting it in there.

mmalik15Author Commented: 2013-01-13

yeah i have seen in the source but can't figure out from where its coming. All i have is the usercontrol( the code is present in the earlier comment) and a web service.

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.Services;
using System.IO;

/// <summary>
/// Summary description for WebService
/// </summary>
[WebService(Namespace = "http://tempuri.org/")]
[WebServiceBinding(ConformsTo = WsiProfiles.BasicProfile1_1)]
// To allow this Web Service to be called from script, using ASP.NET AJAX, uncomment the following line. 
[System.Web.Script.Services.ScriptService]
public class WebService : System.Web.Services.WebService
{

    public WebService()
    {

        //Uncomment the following line if using designed components 
        //InitializeComponent(); 
    }

    [System.Web.Services.WebMethod]
    [System.Web.Script.Services.ScriptMethod]
    public AjaxControlToolkit.Slide[] GetSlides()
    {
        string[] imagenames = System.IO.Directory.GetFiles(Server.MapPath("~/Images/SliderImages/"));
        AjaxControlToolkit.Slide[] photos = new AjaxControlToolkit.Slide[imagenames.Length];
        for (int i = 0; i < imagenames.Length; i++)
        {
            string[] file = imagenames[i].Split('\\');
            photos[i] = new AjaxControlToolkit.Slide("Images/SliderImages/" + file[file.Length - 1], file[file.Length - 1], "");
        }
        return photos;
    }

}