Image (icon) should display from database on the leftside of treeview.

MenuItem Class:
public class MenuItem
    {
        public string Header { get; set; }
        public string Url { get; set; }
        public BitmapImage ImageSource { get; set; }
        public List<menuitem> SubMenuItems { get; set; }
    }

List <menuitem> MenuItems = new List<menuitem>();
MenuItems.Add(
                    new MenuItem()
                    {
                        Header = "Display Name",
                        Url = "NavigationUrl",
                        ImageSource = new System.Windows.Media.Imaging.BitmapImage(new Uri("ur image url from database", UriKind.RelativeOrAbsolute)),
                                            });
//Bind menitems list to ur treeview 
tvLeftMenu.ItemsSource = MenuItems;