The Anchors For FileList Follows. Should really create an image display variant program.

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The FileList Above

    <div id="fileList" runat="server"></div> 

    <script type="text/javascript">
            function debugScroll() {
                var obj = document.getElementById("fileList");
                alert(obj.innerHTML);
            }
    </script>

    protected   string directoryPath = "../Images/";
    public System.Web.UI.HtmlControls.HtmlGenericControl fileList;
    fileList.InnerHtml = "";

If you click the debugScroll prompt an alert box pops up attempting to show the innerHTML of the fileList [Object] Control
The recursive DisplayDirectoryInformation() method function applies a filter file extention list as follows:
string[] extentions = { ".aspx", ".htm", ".html", ".jar", ".gif", ".png", ".xml", ".xslt", ".doc", ".xls", ".cshtml" };
See also ▶Directory List where a toggleDirectory javascript function is injected into fileList.InnerHtml in the code behind.

debugScroll