How to link SQL CE database file to the directory where EXE file of the application exists?

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SQL

Hi,
I use two databases in my application. One for user/password and another for information. I want to link those two databases to my application in a way they can be read from the main directory where EXE file exists, so when I copy my application folder to another computer, the link between my app and databases is kept.
My current connection string is:

sqlcon.ConnectionString = @"Data Source=C:\Users\Dell\Desktop\PMinfo\DataGridView\dbLogin.sdf";

How can I solve this issue?

What I have tried:

sqlcon.ConnectionString = @"Data Source=C:\Users\Dell\Desktop\PMinfo\DataGridView\dbLogin.sdf";