---
title: Part 8, add a new field to an ASP.NET Core MVC app
author: wadepickett
description: Part 8 of tutorial series on ASP.NET Core MVC.
monikerRange: '>= aspnetcore-3.1'
ms.author: wpickett
ms.date: 07/24/2024
uid: tutorials/first-mvc-app/new-field
---
# Part 8, add a new field to an ASP.NET Core MVC app
[!INCLUDE[](~/includes/not-latest-version.md)]
By [Rick Anderson](https://twitter.com/RickAndMSFT)
:::moniker range=">= aspnetcore-9.0"
In this section [Entity Framework](/ef/core/get-started/aspnetcore/new-db) Migrations is used to:
* Add a new field to the model.
* Migrate the new field to the database.
When Entity Framework (EF) is used to automatically create a database from model classes:
* A table is added to the database to track the schema of the database.
* The database is verified to be in sync with the model classes it was generated from. If they aren't in sync, EF throws an exception. This makes it easier to find inconsistent database/code issues.
## Add a Rating Property to the Movie Model
Add a `Rating` property to `Models/Movie.cs`:
[!code-csharp[](~/tutorials/first-mvc-app/start-mvc/sample/mvcmovie90/Models/Movie.cs?name=snippet_AddRating&highlight=19)]
Build the app
### [Visual Studio](#tab/visual-studio)
Press Ctrl+Shift+B
### [Visual Studio Code](#tab/visual-studio-code)
From the *View* menu, select *Terminal* and enter the following command:
```dotnetcli
dotnet build
```
---
Because you've added a new field to the `Movie` class, you need to update the property binding list so this new property will be included. In `MoviesController.cs`, update the `[Bind]` attribute for both the `Create` and `Edit` action methods to include the `Rating` property:
```csharp
[Bind("Id,Title,ReleaseDate,Genre,Price,Rating")]
```
Update the view templates in order to display, create, and edit the new `Rating` property in the browser view.
Edit the `/Views/Movies/Index.cshtml` file and add a `Rating` field:
[!code-cshtml[](~/tutorials/first-mvc-app/start-mvc/sample/MvcMovie90/Views/Movies/IndexGenreRating.cshtml?highlight=16-18,38-40&range=24-72)]
Update the `/Views/Movies/Create.cshtml` with a `Rating` field.
# [Visual Studio](#tab/visual-studio)
You can copy/paste the previous "form group" and let intelliSense help you update the fields. IntelliSense works with [Tag Helpers](xref:mvc/views/tag-helpers/intro).
# [Visual Studio Code](#tab/visual-studio-code)
---
Add the `Rating` property to the remaining `Create.cshtml`, `Delete.cshtml`, `Details.cshtml`, and `Edit.cshtml` view templates.
Update the `SeedData` class so that it provides a value for the new column. A sample change is shown below, but you'll want to make this change for each `new Movie`.
[!code-csharp[](~/tutorials/first-mvc-app/start-mvc/sample/MvcMovie90/Models/SeedDataRating.cs?name=snippet_SeedRating&highlight=6)]
The app won't work until the DB is updated to include the new field. If it's run now, the following `SqlException` is thrown:
`SqlException: Invalid column name 'Rating'.`
This error occurs because the updated Movie model class is different than the schema of the Movie table of the existing database. (There's no `Rating` column in the database table.)
There are a few approaches to resolving the error:
1. Have the Entity Framework automatically drop and re-create the database based on the new model class schema. This approach is very convenient early in the development cycle when you're doing active development on a test database; it allows you to quickly evolve the model and database schema together. The downside, though, is that you lose existing data in the database — so you don't want to use this approach on a production database! Using an initializer to automatically seed a database with test data is often a productive way to develop an application. This is a good approach for early development and when using SQLite.
2. Explicitly modify the schema of the existing database so that it matches the model classes. The advantage of this approach is that you keep your data. You can make this change either manually or by creating a database change script.
3. Use Entity Framework Migrations to update the database schema.
For this tutorial, Entity Framework Migrations is used.
# [Visual Studio](#tab/visual-studio)
From the **Tools** menu, select **NuGet Package Manager > Package Manager Console**.
In the Package Manager Console, enter the following command:
```powershell
Add-Migration Rating
```
The `Add-Migration` command tells the migration framework to examine the current `Movie` model with the current `Movie` DB schema and create the necessary code to migrate the DB to the new model.
The name "Rating" is arbitrary and is used to name the migration file. It's helpful to use a meaningful name for the migration file.
If all the records in the DB are deleted, the initialize method will seed the DB and include the `Rating` field.
In the Package Manager Console, enter the following command:
```powershell
Update-Database
```
The Update-Database command runs the Up method in migrations that have not been applied.
# [Visual Studio Code](#tab/visual-studio-code)
[!INCLUDE[](~/includes/RP-mvc-shared/sqlite-warn.md)]
Delete the Migrations folder and the database file, and then run the following .NET CLI commands:
```dotnetcli
dotnet ef migrations add InitialCreate
```
```dotnetcli
dotnet ef database update
```
For more information, see [Resetting all migrations](/ef/core/managing-schemas/migrations/managing?tabs=dotnet-core-cli#resetting-all-migrations).
---
Run the app and verify you can create, edit, and display movies with a `Rating` field.
> [!div class="step-by-step"]
> [Previous](~/tutorials/first-mvc-app/search.md)
> [Next](~/tutorials/first-mvc-app/validation.md)
:::moniker-end
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