After finishing my C# application I had to make an installer. When i want to choose SQL Express in prerequisites section this error appear :
"Error 3 To enable 'Download prerequisites from the same location as my application' in the Prerequisites dialog box, you must download file 'SqlExpress2008R2\SQLEXPR32_x86_ENU.EXE' for item 'SQL Server 2008 R2 Express' to your local machine. For more information, see http://go.microsoft.com/fwlink/?LinkId=239883."
I use installer extenssion for Visual Studio 2012.