static void Main(string[] args) { Configuration programConfiguration; programConfiguration = ConfigurationMenager.ReadConfiguration(); var optionsBuilder = new DbContextOptionsBuilder <TestAppContext>(); optionsBuilder.UseSqlServer(programConfiguration.Connection.ConnectionString); using (var context = new TestAppContext(optionsBuilder.Options)) { AuthorLoader authorLoader = new AuthorLoader(context); authorLoader.LoadMethod(programConfiguration.AuthorsPath); BookLoader bookLoader = new BookLoader(context); bookLoader.LoadMethod(authorLoader.authorsCount, programConfiguration.BooksPath); } }