In some database environments there is a handy command LOCK TABLE tablename IN EXCLUSIVE MODE. Apparently in SQL Server there is no such command. To accomplish a similar thing in SQLServer you can resort to the following :
declare @bogusVar int begin tran select @bogusVar=1 from tablename with (tablockx)
Just don’t forget to either rollback or commit this when done so you don’t hold this table lock for too long. Use either
I have found this to be handy whenever I am trying to force a lock wait situation for testing purposes.