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public static System.Drawing.Icon GetFolderIcon2( IconSize size, FolderType folderType )
        {
            

            // Need to add size check, although errors generated at present!
            uint flags = Shell32.SHGFI_ICON | Shell32.SHGFI_USEFILEATTRIBUTES;

            if (FolderType.Open == folderType)
            {
                flags += Shell32.SHGFI_OPENICON;
            }
            
            if (IconSize.Small == size)
            {
                flags += Shell32.SHGFI_SMALLICON;
            } 
            else 
            {
                flags += Shell32.SHGFI_LARGEICON;
            }

            flags += Shell32.SHGFI_SYSICONINDEX;

            Shell32.SHFILEINFO FI = new Shell32.SHFILEINFO();

            // System listView
            IntPtr hSysLV = Shell32.SHGetFileInfo("C:\\", 0, ref FI,
                (uint) System.Runtime.InteropServices.Marshal.SizeOf(FI),
                flags);

            
            // Get the folder icon
            Shell32.SHFILEINFO shfi = new Shell32.SHFILEINFO();
            Shell32.SHGetFileInfo(    null, 
                Shell32.FILE_ATTRIBUTE_DIRECTORY, 
                ref shfi, 
                (uint) System.Runtime.InteropServices.Marshal.SizeOf(shfi), 
                flags );


            IntPtr hIcon = CommCtl32.ImageList_GetIcon(hSysLV, shfi.iIcon, flags);

            System.Drawing.Icon.FromHandle(hIcon);    // Load the icon from an HICON handle

            // Now clone the icon, so that it can be successfully stored in an ImageList
            System.Drawing.Icon icon = (System.Drawing.Icon)System.Drawing.Icon.FromHandle(shfi.hIcon).Clone();

            User32.DestroyIcon( shfi.hIcon );        // Cleanup
            return icon;
        }    
    }
public class CommCtl32
    {
        [DllImport("comctl32.dll")]
        public static extern IntPtr ImageList_GetIcon(IntPtr himl, int i, uint flags);
    }