For most relationships, this can be done by updating either foreign key fields or navigation properties.
For many-to-many relationships, the Entity Framework doesn't expose the join table directly, so you add and remove entities to and from the appropriate navigation properties.
The drop-down list sets the This code ensures that when the page is redisplayed to show the error message, whatever department was selected stays selected.
My versions keep as close to the originals as possible, changing only the coding language.
The navigation path through the series is as follows: When a new course entity is created, it must have a relationship to an existing department.
To facilitate this, the scaffolded code includes controller methods and Create and Edit views that include a drop-down list for selecting the department.
They are intended to be followed sequentially as each section builds on the knowledge imparted in the previous sections. Once the project is opened in your IDE, press Shift+Ctrl+B to build the solution.
Progress through the sections is reflected in a Visual Studio Express for Web project download that accompanies each section which features the web application that you build through the series. This will ensure that all packages are restored from Nuget and may take a while depending on your Internet connection speed.
This tutorial is the eighth in a series of 12 that teach you how to build MVC 5 applications using Entity Framework for data access and Visual Basic.In the previous tutorial you displayed related data; in this tutorial you'll update related data.The narrative text is largely unchanged from the original and is used with permission from Microsoft.This tutorial series teaches you how to create ASP.NET MVC 5 applications using the Entity Framework 6 and Visual Studio 2013 Express for Web. For information about how to choose between Code First, Database First, and Model First, see Entity Framework Development Workflows.The tutorial series comprises 12 sections in total.