Program.cs

public class Program
{
    public static void Main(string[] args)
    {
        var builder = new ConfigurationBuilder()
            .SetBasePath(Directory.GetCurrentDirectory())
            .AddJsonFile("appsettings.json", optional: false, reloadOnChange: true)
            .AddEnvironmentVariables();

        IConfigurationRoot configuration = builder.Build();

        var settings = new MySettings();
        configuration.Bind(settings);

        var moduleSettings = new MyModuleSettings();
        configuration.GetSection("SectionA").Bind(moduleSettings);

        Console.WriteLine($"My application name is '{settings.ApplicationName}'");
        Console.WriteLine($"My module name is '{moduleSettings.ModuleName}'");

        Console.ReadLine();
    }
}