I assume that you are using application settings and have a connection string in FirstProject .
Like this:

The generated settings class is marked with internal sealed partial .. , so you cannot access it directly through MyProject.Properties.Settings..
You simply create a class to display it:
namespace FirstProject { public class ThisProjectSettings { public static string ConnectionString { get { return Settings.Default.Conn; } } } }
Then use it from your second project as follows:
FirstProject.ThisProjectSettings.ConnectionString
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