I am updating some set of records in that table, after that I need to make this table read only.
So how to make a table Read Only in SQL Server?
If you want it as read only to the general public, but still want to be able to edit the table at a later date, you may want to consider creating multiple users for the database and granting different permissions to that database - ideally you should be doing this anyway and not allow the general public access to alter table, truncate etc.