Web app works in Firefox but not IE8

Question

I've built this app that displays employee photos stored in several sharepoint folders. It also displays the employee name extracted from the file name and a previous and next button to move through the photos.

The markup is surrounded by an update panel to prevent the entire page from reloading when you click to view the next photo.

The app is working fine in firefox, but the images do not display in IE8. Can anyone tell what is causing this?

public List<string> photoFileList = new List<string>();

    protected void Page_Load(object sender, EventArgs e)
    {
        if (!IsPostBack) 
        {
            Session["index"] = 0;
            Session["CountOfPictures"] = 0;

            List<string> PhotoFolders = new List<string>();
            PhotoFolders.Add("\\\\intranet.org\\Photo Album\\Employees\\Dept1");
            PhotoFolders.Add("\\\\intranet.org\\Photo Album\\Employees\\ Dept2");
            PhotoFolders.Add("\\\\intranet.org\\Photo Album\\Employees\\ Dept3");
            PhotoFolders.Add("\\\\intranet.org\\Photo Album\\Employees\\ Dept4");
            PhotoFolders.Add("\\\\intranet.org\\Photo Album\\Employees\\ Dept5”);
            PhotoFolders.Add("\\\\intranet.org\\Photo Album\\Employees\\ Dept6");
            PhotoFolders.Add("\\\\intranet.org\\Photo Album\\Employees\\ Dept7");
            PhotoFolders.Add("\\\\intranet.org\\Photo Album\\Employees\\ Dept8");
            PhotoFolders.Add("\\\\intranet.org\\Photo Album\\Employees\\ Dept9");
            PhotoFolders.Add("\\\\intranet.org\\Photo Album\\Employees\\ Dept10");
            PhotoFolders.Add("\\\\intranet.org\\Photo Album\\Employees\\ Dept11");

            Session["AllPhotoFolders"] = PhotoFolders;

           List<string> AllPhotoFolders = (List<string>)Session["AllPhotoFolders"];

           foreach (string folder in AllPhotoFolders)
           {

               DirSearch(folder);
           }

           Session["AllPhotoFiles"] = photoFileList;
           Image1.ImageUrl = photoFileList[0].Replace("\\", "//");
           var list = (List<string>)Session["AllPhotoFiles"];
           lblName.Text = System.IO.Path.GetFileName(list[0]).Substring(0, System.IO.Path.GetFileName(list[0]).Length - 4).Replace("_", " ");

           Session["CountOfPictures"] = photoFileList.Count;




        }
    }

    void DirSearch(string sDir)
    {
        foreach (string f in Directory.GetFiles(sDir, "*.JPG"))
        {
            //BulletedList1.Items.Add(f);
            photoFileList.Add(f);
        }

        foreach (string d in Directory.GetDirectories(sDir))
        {
            if (!d.EndsWith("_t") && !d.EndsWith("_w")) 
            { DirSearch(d);}

        }

    }


protected void btnNext_Click(object sender, EventArgs e)
    {
        int NextIndex = (int)Session["index"];
        int PictureCount = (int)Session["CountOfPictures"];
        NextIndex += 1;

        if (NextIndex == PictureCount)
        {
            NextIndex = 0;
        }

        Session["index"] = NextIndex;
        var list = (List<string>)Session["AllPhotoFiles"];
        Image1.ImageUrl = list[NextIndex].Replace("\\", "//");
        lblName.Text = System.IO.Path.GetFileName(list[NextIndex]).Substring(0,System.IO.Path.GetFileName(list[NextIndex]).Length - 4).Replace("_"," ");
        lblName.Visible = true;
    }




protected void btnPrevious_Click(object sender, EventArgs e)
    {
        int NextIndex = (int)Session["index"];
        int PictureCount = (int)Session["CountOfPictures"];
        NextIndex -= 1;

        if (NextIndex == -1)
        {
            NextIndex = PictureCount - 1;
        }

        Session["index"] = NextIndex;
        var list = (List<string>)Session["AllPhotoFiles"];
        Image1.ImageUrl = list[NextIndex].Replace("\\", "//");
        lblName.Text = System.IO.Path.GetFileName(list[NextIndex]).Substring(0, System.IO.Path.GetFileName(list[NextIndex]).Length - 4).Replace("_", " ");
        lblName.Visible = true;
    }

<asp:Content ID="Content2" ContentPlaceHolderID="MainContent" Runat="Server">
    <asp:ScriptManager ID="ScriptManager1" runat="server">
    </asp:ScriptManager>

    <br /><br />
    <asp:UpdatePanel ID="UpdatePanel1" runat="server">
    <ContentTemplate>

    <table>
    <tr>
    <td><asp:Image ID="Image1" runat="server" Height="400px" Width="400px" /></td>
    <td>&nbsp;</td>
    <td><asp:Label ID="lblName" runat="server" Text="Label" Font-Size="X-Large"></asp:Label></td>
    </tr>
    <tr >    <td>
       <div style="text-align:center"> <asp:Button style="text-align:center" ID="btnPrevious" runat="server" Text="Previous" 
        onclick="btnPrevious_Click" Width="125px" />
     <asp:Button style="text-align:center" ID="btnNext" runat="server" Text="Next" onclick="btnNext_Click" 
            Width="125px" /></div></td></tr>


    </table>

    </ContentTemplate>
    </asp:UpdatePanel>


</asp:Content>

Answer 1

I think I have reproduced the problem.

You are not adding http: to the url, and you are doubling the slashes. The code would appear to generate output like this:

<img src="////intranet.org//image//path//some_image.jpg">

This actually seems to work in Firefox and Chrome but not IE. The problem isn't the double-slashes between the folder/file names, it's the four of them up front.

Removing the double-slashes (as replaces each backslash from your file path) as I suggested in a comment before ought to solve it. Also consider adding "http:" to the url so it is properly formed.