public void RemoveAllLocksForUser(User user)
{
List <long> idList = LockedDocumentRegistry.
Where(entry => entry.Value.Id == user.Id).
Select(entry => entry.Key).
ToList();
foreach (long itemId in idList)
{
User lockOwner;
LockedDocumentRegistry.TryRemove(itemId, out lockOwner);
}
}
