Find ASP.Net ImageButton and set ImageUrl using C#

How do I load multiple images (approximately 100 images) from a folder to ASP.Net Image Buttons using any loop.

The code is currently resulting in a null value for the image URL.

What I Treid

string Commented = "~/Files/Temp/";
DirectoryInfo dir = new DirectoryInfo(MapPath(Commented));
FileInfo[] suppportimage = dir.GetFiles();
ArrayList listItems = new ArrayList();
int j = 1;
foreach (FileInfo info in suppportimage)
{
    listItems.Add(info);
    string strFileExtention = System.IO.Path.GetExtension(info.ToString()).ToUpper();
    if (strFileExtention == ".JPEG || strFileExtention.ToUpper() == ".JPG")
    {
            ((WebControl)(panelx.FindControl("imgSupport0" + j))).Attributes["ImageUrl"] = Commented + info;
            j++;
 
    }
}