Attach Db From Installer (only Read Mode)

Hi,
I have made setup of my program,
I need to attach a db to the server. To do this:
- Copy mdf and ldf files into default data folder of instance of sqlexpress
- run scrip from custom action in the installer that:
a. attach the db
b. create login
c. create user for login in db

There is a problem...I run script slq file by sqlcmd and launch it from a c# process.

The rusult is that the db was attacched but in only read mode, and the point c not work.

If I execute manually the same script sql with sqlcmd in dos window, it work without problem in all point: a,b and c

What are the reason of this?

I think that start process in c# not work correctly....this is the code:


process = new Process();



process.StartInfo.FileName = "sqlcmd.exe";

process.StartInfo.Arguments = commandLine;



process.Start();

process.WaitForExit();

help me, plese!
thanks in advance

andrea