Problems With Transaction Scope Time Out

Hi, i'm trying to run wrap a transaction around a block of code to make sure every statement is carried out.  Here's what i have:

using (TransactionScope ts = new TransactionScope())

{
   ...
   ts.Complete();
}The code executed in the ... part is a set of sql commands within my dal.  If this above expression takes less than 30 seconds everything is carried out correctly, however if it takes longer than 30 seconds i receive an sql timeout error.  I tried modify the above code to:

using (TransactionScope ts = new TransactionScope(TransactionScopeOption.Required, TimeSpan.FromMinutes(5)))

{
   ...
   ts.Complete();
}

But it did not seem to make a difference.  I suppose the easiest option would be to increase the timeout for every sql command in my dal but i feel that the 30 second timeout is sufficient for a single command.

Appreciate if someone could tell me how this should be done correctly.  Thanks