How to drop the datafile?

Hello Everybody
is it possible to drop the datafile? i have run the query ALTER DATABASE DATAFILE 'c:\oracle\oracle_db\m300\user\user01.dbf' offline drop. After i checked with DBA_DATA_FILES its there.Can any one help in this regards
Regards
Hameed

Please see this link:
http://download-west.oracle.com/docs/cd/B19306_01/server.102/b14231/dfiles.htm#i1006556
Restrictions for Dropping Datafiles
The following are restrictions for dropping datafiles and tempfiles:
The database must be open.
If a datafile is not empty, it cannot be dropped.
If you must remove a datafile that is not empty and that cannot be made empty by dropping schema objects, you must drop the tablespace that contains the datafile.
You cannot drop the first or only datafile in a tablespace.
This means that DROP DATAFILE cannot be used with a bigfile tablespace.
You cannot drop datafiles in a read-only tablespace.
You cannot drop datafiles in the SYSTEM tablespace.
If a datafile in a locally managed tablespace is offline, it cannot be dropped.
Regards

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