Problem with table locking in Yukon (SQL 2005)

Hi there,
Let me thanks to all of you for giving satisfactory answers to all my previous queries regarding DTS in MS-SQL server2000.

Now I've problem with table locking in MSSQL 2005 (Yukon).
I want to lock table for Insert/Update/Delete operation.
Situation is something like this..

I want to lock table for Insert operation.
Once I locked the table, it should not allow me to insert records further ahead. Same way for delete & update..
After certain routines , I need to unlock the table.

Kindly let me know equivalent syntax in T-SQL , MS-SQL Server2005 (Yukon).

Thanks in advance.

Avadhoot

Tried 'insert table_name with (holdlock) ... values ...'?