sql "trim" in asp.net c# & connection strings

[willthepirate]

if anyone could spare me 2 minuites it would be Greatly appreciated,

basically im playing around with c# and experimenting with shopping carts.

im reading this tutorial:
http://www.worldofasp.net/tut/Shopp...opping_Cart_using_ASPNET_and_Cookies_129.aspx

and im trying to get the connection string sorted so that it will connect to an .mdf file in the app_data folder.

ive tried modifying the connection to point to another connection in the web.config, but i get told off about "trim" not bieng defined.

i imagine its a quick fix of the connection string, but im a complete beginner