asp.net c＃SqlDataSource timout问题

I'm trying to extend the timeout of an SqlDataSource beyond 30 second (Seems to be the default). I'm trying to run a stored procedure that has to run through 100,000s of records. During busy periods it times out. I'm using ASP.NET 4.0 and IIS 6.0 on 2003 server.I'm trying to extend the timeout of an SqlDataS