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.

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 apply a unique constraint on a column in Entity Framework Core using the Fluent API, you should use the IsUnique method. This method ensures that the database enforces uniqueness for the specified column or columns, preventing duplicate values from being inserted. It's a crucial feature for maintaining data integrity.

In ASP.NET Core, the [Route] attribute is used to define the route template for an action method. This template determines how the URL should be structured to access the method. For example, [Route("api/products")] specifies that the method should be reachable at the URL "api/products."

In ASP.NET Core, you can fetch the username of the currently logged-in user by accessing HttpContext.User.Identity.Name. This property contains the username of the authenticated user, allowing you to display a personalized greeting like "Welcome, [Username]!".

The [Authorize] attribute in ASP.NET Core is primarily used for Authorization, not Authentication. It restricts access to a particular action method or controller to only authenticated users who meet specific authorization requirements. This helps in controlling who can access different parts of your application based on roles or policies.

When defining a one-to-many relationship in Entity Framework Core, the HasMany method is commonly used to represent the "many" side of the relationship. This method allows you to specify the navigation property on the "one" side and configure various aspects of the relationship, such as cascading deletes and foreign key constraints on the "many" side. It's an essential part of modeling complex database relationships.

In ASP.NET Core MVC, the default convention for locating views is in the "Views" folder within the project's directory structure. Views contain the markup and templates used to generate the HTML or other output sent to the client's browser.

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.

The asp-action attribute in a Razor form specifies the Action Method to which the form will be submitted. This attribute defines the method in the controller that will handle the form submission. It's an essential part of creating interactive web forms in ASP.NET Core.