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Update da1.md (#10070) 

* Update da1.md

* Minor edits
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SB 2018-12-20 19:40:08 -05:00 committed by Scott Addie
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aspnetcore/tutorials/razor-pages/da1.md
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@ -4,7 +4,7 @@ author: rick-anderson
description: Learn how to update the generated pages in an ASP.NET Core app.
monikerRange: '>= aspnetcore-2.2'
ms.author: riande
ms.date: 12/3/2018
ms.date: 12/20/2018
uid: tutorials/razor-pages/da1
---
# Update the generated pages in an ASP.NET Core app
@ -64,22 +64,22 @@ A request to the page with the "{id:int}" route template that does **not** inclu
@page "{id:int?}"
```
To test the behavior or `@page "{id:int?}"`:
To test the behavior of `@page "{id:int?}"`:
* Set the page directive in *Pages/Movies/Details.cshtml* to `@page "{id:int?}"`
* Set the page directive in *Pages/Movies/Details.cshtml* to `@page "{id:int?}"`.
* Set a break point in `public async Task<IActionResult> OnGetAsync(int? id)` (in *Pages/Movies/Details.cshtml.cs*).
* Navigate to `https://localhost:5001/Movies/Details/`
* Navigate to `https://localhost:5001/Movies/Details/`.
With the `@page "{id:int}"` directive, the break point is never hit. The routing engine return HTTP 404. Using `@page "{id:int?}"`, the `OnGetAsync` method returns `NotFound` (HTTP 404).
Although not recommended, you could write the the delete method as:
Although not recommended, you could write the `OnGetAsync` method (in *Pages/Movies/Delete.cshtml.cs*) as:
[!code-csharp[](~/tutorials/razor-pages/razor-pages-start/sample/RazorPagesMovie22/Pages/Movies/Delete.cshtml.cs?name=snippet)]
Test the preceding code:
* Select a delete link.
* Remove the ID from the URL. For example, change `https://localhost:5001/Movies/Delete/8` to `https://localhost:5001/Movies/Delete`
* Select a **Delete** link.
* Remove the ID from the URL. For example, change `https://localhost:5001/Movies/Delete/8` to `https://localhost:5001/Movies/Delete`.
* Step through the code in the debugger.
### Review concurrency exception handling
@ -120,7 +120,7 @@ When the Movies/Edit page is posted:
public Movie Movie { get; set; }
```
* If there are errors in the model state (for example, `ReleaseDate` cannot be converted to a date), the form is posted again with the submitted values.
* If there are errors in the model state (for example, `ReleaseDate` cannot be converted to a date), the form is displayed with the submitted values.
* If there are no model errors, the movie is saved.
The HTTP GET methods in the Index, Create, and Delete Razor pages follow a similar pattern. The HTTP POST `OnPostAsync` method in the Create Razor Page follows a similar pattern to the `OnPostAsync` method in the Edit Razor Page.