ImageEnable is depracated, try using Client Automation Tools (aka CAT) instead. For sample code, check out this post. At line 21 you would do this kind of thing:

EntryInfo entryInfo = Entry.GetEntryInfo(entryId, session);
if (entryInfo.EntryType == EntryType.Document)
{
    DocumentInfo docInfo = (DocumentInfo)entryInfo;
    // Do something with the document
}
else if (entryInfo.EntryType == EntryType.Folder)
{
    FolderInfo foldInfo = (FolderInfo)entryInfo;
    // Do something with the folder
}