How to accessing image from local drive order by creation datetime using Linq

string localPath = "D:\\Tharani\\Images\\";
string[] filePaths = Directory.GetFiles(localPath);
List<ListItem> files = new List<ListItem>();
foreach (string filePath in filePaths)
{
    string fileName = Path.GetFileName(filePath);
    // string contenttype = "image/" + Path.GetExtension(fileName).Replace(".", "");
    string contenttype = Path.GetExtension(fileName);
    FileStream fs = new FileStream(filePath, FileMode.Open, FileAccess.Read);
    BinaryReader br = new BinaryReader(fs);
    bytes = br.ReadBytes((Int32)fs.Length);
    // bytesss = bytes;
    string base64String;
    base64String = System.Convert.ToBase64String(bytes, 0, bytes.Length);
    // files.Add(new ListItem(fileName, "data:" + contenttype + ";base64," + base64String));
    imgViewFile.ImageUrl = "data:image/png;base64," + base64String;
    Session["Img"] = base64String;
}