Try to put this
<connectionStrings>
<add name="conn2" connectionString="Data Source=192.?.?.?\your_db_instance;Initial Catalog=your_db_schema;Integrated Security=False;User ID=your_db_login;Password=??????" providerName="System.Data.SqlClient"/>
</connectionStrings>
within Web.config/app.config file in your project, to ensure the project will work fine with the database.
Many Thanks & Best Regards, Hua Min