Added items for pages 573 and 601

docs/errata/README.md

@@ -4,6 +4,6 @@ If you find any mistakes in the seventh edition, *C# 11 and .NET 7 - Modern Cros
 
 [**Errata** (31 items)](errata.md): Typos, tool user interface changes, or mistakes in code that would cause a compilation error that prevents a successful build.
 
-[**Improvements** (11 items)](improvements.md): Changes to text or code that would improve the content. These are optional.
+[**Improvements** (13 items)](improvements.md): Changes to text or code that would improve the content. These are optional.
 
 All errata and improvements will be included in the 8th edition planned for publishing in November 2023. To be included they must be submitted by mid-September 2023.

docs/errata/improvements.md

@@ -1,4 +1,4 @@
-**Improvements** (11 items)
+**Improvements** (13 items)
 
 If you have suggestions for improvements, then please [raise an issue in this repository](https://github.com/markjprice/cs11dotnet7/issues) or email me at markjprice (at) gmail.com.
 
@@ -11,6 +11,8 @@ If you have suggestions for improvements, then please [raise an issue in this re
 - [Page 453 - Scaffolding models using an existing database](#page-453---scaffolding-models-using-an-existing-database)
 - [Page 547 - Creating a class library for a Northwind database context](#page-547---creating-a-class-library-for-a-northwind-database-context)
 - [Page 551 - Creating a class library for entity models using SQL Server](#page-551---creating-a-class-library-for-entity-models-using-sql-server)
+- [Page 573 - Adding code to a Razor Page](#page-573---adding-code-to-a-razor-page)
+- [Page 601 - Setting up an ASP.NET Core MVC website](#page-601---setting-up-an-aspnet-core-mvc-website)
 - [Page 654 - Making controller action methods asynchronous](#page-654---making-controller-action-methods-asynchronous)
 - [Page 655 - Exercise 14.2 – Practice implementing MVC by implementing a category detail page](#page-655---exercise-142--practice-implementing-mvc-by-implementing-a-category-detail-page)
 
@@ -292,6 +294,22 @@ public static IServiceCollection AddNorthwindContext(
 }
 ```
 
+# Page 573 - Adding code to a Razor Page
+
+This section starts with a description of Razor Pages. The first bullet point says, "They require the `@page` directive at the top of the file."
+
+In the next edition, I will add a warning, as shown in the following note:
+
+> **Warning!** *Razor Pages* are different from *Razor Views* (used in ASP.NET Core MVC) but they share the same file extension `.cshtml`. When creating a *Razor View*, do NOT use the `@page` directive! If you do, the controller will not pass the model to it and the model in the view will be `null`, throwing a `NullRefertenceException` when you try to access any of its members.
+
+# Page 601 - Setting up an ASP.NET Core MVC website
+
+This sections starts with a description of the three parts of MVC. For views, I wrote, "Views: Razor files, that is, `.cshtml` files, that render data in view models into HTML web pages. Blazor uses the `.razor` file extension, but do not confuse them with Razor files!"
+
+In the next edition, I will changed this text and add a warning:
+
+"Views: *Razor View* files, that is, `.cshtml` files, that render data in view models into HTML web pages. *Razor Views* are different from *Razor Pages* but they share the same file extension `.cshtml`. When creating a *Razor Page*, you must add the `@page` directive at the top of the file. When creating a *Razor View*, do NOT use the `@page` directive! If you do, the controller will not pass the model to it and the model in the view will be `null`, throwing a `NullRefertenceException` when you try to access any of its members. Blazor uses the `.razor` file extension, but do not confuse them with *Razor View* or *Razor Page* files! Blazor can also use the `@page` directive to allow a Blazor component to act like a page!"
+
 # Page 654 - Making controller action methods asynchronous
 
 In an earlier task, you imported the `Microsoft.EntityFrameworkCore` namespace so that you could use the `Include` extension method. In Step 1, I tell you to use the `ToListAsync` method to implement the `Index` action method asynchronously. If you had not previously imported the `Microsoft.EntityFrameworkCore` namespace then you would have to import it now to use the `ToListAsync` method.