How can I run C# app which contains local SQL Server database on another computer? -

i have created c# program sql server database. works fine on computer on friend's pc doesn't (my friend doesn't have sql sever 2008). possible make without installation? , if can, how can done?

this connection string:

connectionstring="data source=\v11.0;attachdbfilename=|datadirectory|\maindatabase.mdf;integrated security=true" 

sql server server databases. can change project use sql server ce (sql server compact edition) single-file local database. similar "true" sql server may easiest solution. code wont change except connection string.