In ProductsController (bug introduced in Chapter 4, section 2)

var vm = new ProductsListViewModel { Products = **products**.Select(x => new ProductViewModel { MSRP = x.MSRP, Name = x.Name, Price = x.Price, SKU = x.SKU, Rating = ratings.FirstOrDefault(y => x.SKU == y.SKU), }) };

should be

var vm = new ProductListViewModel { Products = **model**.Select(x => new ProductViewModel { MSRP = x.MSRP, Name = x.Name, Price = x.Price, SKU = x.SKU, Rating = ratings.FirstOrDefault(y => x.SKU == y.SKU) }) }

In AllowPartialRenderingAttribute (bug introduced in Chapter 5, Section 1)
if (request == null) return;

should be

if (result== null) return;

Was going through your course and noticed these two errors. Haven't finished it yet but thanks for the excellent course.

When I was working on Chapter 03 Challenge, I got an error saying "The trust relationship between this workstation and the primary domain failed" in _Layout.cshtml line 32.

@if (User.IsInRole(HPlusSports.Models.UserRoles.Admin))

I use Windows 10, Visual Studio 2017 Community Edition and IIS Express when got this error.

From this solution, I found that User.IsInRole seems to throw an exception when Windows.Identity.IsAuthenticated is false. So I use that solution, adding an authentication checking before User.IsInRole.
Below is the solution.

@if (User.Identity.IsAuthenticated && User.IsInRole(HPlusSports.Models.UserRoles.Admin))