To add a user to a specific role immediately after creating them programmatically, you would use the AddToRoleAsync method of the UserManager class. This method allows you to assign a user to a role, granting them the associated permissions and access rights.

To prevent a Razor form from being submitted if client-side validation fails, you can use the onsubmit attribute on the form element. By specifying a JavaScript function that returns false when validation fails, you can stop the form submission and show validation errors to the user.

Azure App Service is a Platform-as-a-Service (PaaS) offering that allows developers to build, deploy, and scale web apps and APIs easily. It provides a fully managed environment for hosting ASP.NET Core applications in the Azure cloud.

ASP.NET Core Identity provides the "Password Requirements" feature to specify criteria for user passwords, including the minimum length. This is essential for enforcing security standards, and developers can configure it as needed in their applications.

In attribute routing, the order of route definitions is significant because it determines the priority of routes. Routes are evaluated in the order they are defined, and the first matching route is used. This allows you to control which route handles a particular request when there are multiple possible matches.

To send binary content as the response in ASP.NET Core, you should use the FileResult action result. This result type allows you to send files, such as images, PDFs, or any binary data, in response to a client request. You can specify the file's content type, name, and other details.

HTTPS (Hypertext Transfer Protocol Secure) is the recommended method for highly secure data transmission in Web APIs. It adds a layer of encryption (SSL/TLS) to the HTTP protocol, ensuring that data transmitted between the client and server is encrypted and secure from eavesdropping or tampering.

Entity Framework Core (EF Core) uses lazy loading proxies to enable lazy loading for navigation properties. To configure it, you can set the UseLazyLoadingProxies option to true in the DbContext's configuration. This allows EF Core to create dynamic proxies for your entities, enabling lazy loading for related entities.

ASP.NET Core introduced a flexible and extensible configuration system that allows developers to configure applications using various sources, such as JSON, XML, environment variables, command-line arguments, and more. This approach offers better configurability and ease of use compared to the traditional ASP.NET configuration methods.

The "Email Confirmation" feature in ASP.NET Core Identity allows users to verify their email addresses before gaining full access to the application. This is crucial for scenarios like e-commerce websites, ensuring that users have valid and verified email addresses before making purchases.

In ASP.NET Core, configuration settings can be stored in various JSON files, such as "appsettings.json" for general settings. However, when deploying to production, the configuration values in "appsettings.Production.json" take precedence over those in "appsettings.json." This allows developers to maintain separate configurations for different environments.

ASP.NET Core routing uses a first-match-wins strategy. In this case, the incoming request "/products/new" matches the second route "/products/new" exactly. Therefore, it will not proceed to check other routes and will be handled by the "/products/new" route.