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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.
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.
To facilitate efficient lookups, the latter two collections are stored in Hash Set objects.
If the check box for a course was selected but the course isn't in the Instructor.
If the number of courses were much greater, you would probably want to use a different method of presenting the data in the view, but you'd use the same method of manipulating navigation properties in order to create or delete relationships.
To provide data to the view for the list of check boxes, you'll use a view model class.
The Course Index page is displayed with the new course added to the list.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 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.