public static void AddSubFolder(FolderDescriptor folder, FolderDescriptor subFolder)
{
IResource parentFolder = null;
if (folder != null)
{
parentFolder = Find(folder.FolderIDs.EntryId);
}
IResource resFolder = FindOrCreate(subFolder, parentFolder);
if (Folder.IsParentRoot(resFolder) || Folder.IsParentParentRoot(resFolder))
{
SetDefault(resFolder, true);
}
}