Problem with SQL Express DB !!

Hi,
I have a SQLExpress database in my project and it's working well in my Computer ,But when i deploy my project and install in another pc my app can not login to the server ,please give me a compelete help about this problem , and about how to include an SQLExpress database to a project setup ,

this is my Connection string :

"Data Source=(local)\SQLExpress;Initial Catalog=Lib;I ntegrated Security=True;providerName="System.Data.SqlClient"

and i'm running it on the local machine .

Tanx .

[748 byte] By [Donor_044] at [2007-12-22]