C# database error when connecting another pc

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C#

SQL

My program stores the data in the database created on the Visual studio 2012 Everything works fine on a my PC question is how should I connect to the database if I want to open the program from another computer? I tried copying the program on a friend's computer but it cannot find the database program stop work

This is the connection string

SqlCeConnection con = new SqlCeConnection("Data Source=H:\\apps\\application.sdf");

So I change connection string like this
Get the application run path because DB is in the application folder

string appPath = Path.GetDirectoryName(Application.ExecutablePath);
SqlCeConnection con = new SqlCeConnection(""@ Data Source =" + appPath + "\application.sdf");

No error No stuck in but still not connect
I'm new to C# I think this is a stupid way to do this
How to do this
Thank in Advance