Usage of braces without definition of function, struct etc

Question

While analysing of Orchard.cms source code, I've found interesting code, when brackets in C# were used not for definition of any internal object. Seem it was made for some context usage. Can you please clarify what's goal of using brackets like this?

Here is code sample of it:

 builder.RegisterType<DefaultOrchardHost>().As<IOrchardHost>().As<IEventHandler>().SingleInstance();
 {
     builder.RegisterType<ShellSettingsManager>().As<IShellSettingsManager>().SingleInstance();

     builder.RegisterType<ShellContextFactory>().As<IShellContextFactory>().SingleInstance();
     {
         builder.RegisterType<ShellDescriptorCache>().As<IShellDescriptorCache>().SingleInstance();

         builder.RegisterType<CompositionStrategy>().As<ICompositionStrategy>().SingleInstance();
         {
             builder.RegisterType<ShellContainerRegistrations>().As<IShellContainerRegistrations>().SingleInstance();
             builder.RegisterType<ExtensionLoaderCoordinator>().As<IExtensionLoaderCoordinator>().SingleInstance();
             builder.RegisterType<ExtensionMonitoringCoordinator>().As<IExtensionMonitoringCoordinator>().SingleInstance();
             builder.RegisterType<ExtensionManager>().As<IExtensionManager>().SingleInstance();
             {
                 builder.RegisterType<ExtensionHarvester>().As<IExtensionHarvester>().SingleInstance();
                 builder.RegisterType<ModuleFolders>().As<IExtensionFolders>().SingleInstance()
                     .WithParameter(new NamedParameter("paths", new[] { "~/Modules" }));
                 builder.RegisterType<CoreModuleFolders>().As<IExtensionFolders>().SingleInstance()
                     .WithParameter(new NamedParameter("paths", new[] { "~/Core" }));
                 builder.RegisterType<ThemeFolders>().As<IExtensionFolders>().SingleInstance()
                     .WithParameter(new NamedParameter("paths", new[] { "~/Themes" }));

                 builder.RegisterType<CoreExtensionLoader>().As<IExtensionLoader>().SingleInstance();
                 builder.RegisterType<ReferencedExtensionLoader>().As<IExtensionLoader>().SingleInstance();
                 builder.RegisterType<PrecompiledExtensionLoader>().As<IExtensionLoader>().SingleInstance();
                 builder.RegisterType<DynamicExtensionLoader>().As<IExtensionLoader>().SingleInstance();
                 builder.RegisterType<RawThemeExtensionLoader>().As<IExtensionLoader>().SingleInstance();
             }
         }

         builder.RegisterType<ShellContainerFactory>().As<IShellContainerFactory>().SingleInstance();
     }

     builder.RegisterType<DefaultProcessingEngine>().As<IProcessingEngine>().SingleInstance();
 }

Answer 1

The goal in this case is only to make it easier for a developer/human to understand how the types relate hierarchically when reading the code in order to easier understand the code.

(Using curly braces like this will indent the lines in most IDE's, such as Visual Studio)