Centralized you database and install application on clint machine.
You must need to make connection string according to Remote database and put it in app.config file and then use.
see
connection string fromate.
if you want to use MS access then you can put accdb/mdb file on network drive or share folder and use IP address
<add key="con" value="Data Source=192.168.1.1;Initial Catalog=omx;Persist Security Info=True;User ID=sa;Password=s12345%$#@!"/>