SQLServer Express Edition Auto Install

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Hi,
I have written a program which uses SQL Server Express Edition (2005)
for the database. I have created an install program using VS.NET 2008
for it. But I have a problem:
I want to install and configure SQL Sevre automatically (through code
or install program) so that any user can install my program without
any problems.
Can anyone please help?
Thanks in advance.
.