public static void Initialize(IServiceProviderFactory serviceProvider) { using (var context = new CellPhonesContext(serviceProvider.GetRequiredService<DbContextOptions<CellPhonesContext>>())) { //Look for any cellphones. if(context.Cellphone.Any()) { return; //DBhas been seeded } context.Cellphone.AddRange( new Cellphone { Make = "iPhone", Model = "5s", OS = "MacOS", ScreenSize = "1240 x 1560" }, new Cellphone { Make = "iPhone", Model = "6", OS = "MacOS", ScreenSize = "1240 x 1560" }, new Cellphone { Make = "iPhone", Model = "X", OS = "MacOS", ScreenSize = "2560 x 4000" } },