If I'm using SQL Server Express in my application (MDF) file.

I then build the application package to install the application on another PC.

Will the installation package install all the required files for SQL Server Express or does SQL Server Express need to be installed as well?

Cheers!!!

Gary

Sql Express must be installed on that machine prevously. You can set a prerequisity for SQL Express as a property in Setup project, you can check many prerequisities like .NET 2.0 and also this one. This will help user to download and istall them directly from microsoft all required components. When he start setup.exe it will show the messages for all missing components and a link from where to download.