Question

I need to block a table from being accessed by any other process unless my current operation(usually a INSERT or an UPDATE) is completed, Is there a way to lock and unlock sql server tables from .net code without using stored procedures, i need these to avoid business rules based duplicate records from being entered into the table.

Answer 1

You an use a hint

insert into table with (tablock) (colx) values (‘newValuex’);

If valuex is a primary key or has a unique constraint then it will be enforced.

But you don’t need a tabloc to enforce that constraint.

If you have multiple statements then you can wrap them in a transaction.