title: How to lock/unlock files from performing crud operations using angular?
body: <p>Basically, I have a  with a list of files fetched from blob storage,on which users can perform crud.  I'd like to set the permission to particular files or folders so that other users cannot accidentally delete or modify the files/folder.  How can I achieve it using angular? or azure blob storage? How can we know if files are being used? or user has to manually lock the files so that other users won't be able to modify them?</p>