Hi everyone!
I am bignner in vb.net and i have develo[ed a small application of vb forms in which i have use a service based sql server databas(.mdf)i want to make its msi installer last time i have made it and after installation application giving error for connecting to sql server plz help me.

If you're connecting to a networked SQL server, then perhaps the problem is the credentials.
If you're connecting through Windows Authentication, then other users may not have access to the server.
You should create a dedicated user on the SQL server, and use that account in the connectionstring for connecting to the server.

If you're using MS SQL Server Express, then this will be a good read: