wdywttt3-XmlSettings.cs

var configurationBuilder = new ConfigurationBuilder();
configurationBuilder.AddAppSettings();
configurationBuilder.AddConnectionStrings();
var configuration = configurationBuilder.Build();

var appSettings = configuration.Get<AppSettings>("AppSettings);
var connectionString = configuration["Data:DefaultConnection:ConnectionString"];
var providerName = configuration["Data:DefaultConnection:ProviderName"];