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The code declares a long-running instance of Product Context. The Product Context object is used to query and save data to the database. The To Binding List extention method is defined in the Entity Framework assembly. Products] PRIMARY KEY ([Product Id]) ) CREATE INDEX [IX_Category Id] ON [dbo].[Products]([Category Id]) ALTER TABLE [dbo].[Products] ADD CONSTRAINT [FK_dbo. Categories_Category Id] FOREIGN KEY ([Category Id]) REFERENCES [dbo].[Categories] ([Category Id]) ON DELETE CASCADE Once the reverse engineer process completes the new model is added to your project and opened up for you to view in the Entity Framework Designer.
When we dragged-and-dropped Products from under the Category, the Win Forms took care of setting up the products Binding Source.
Data Source property to category Binding Source and products Binding Source. Because of this binding, only the products that belong to the currently selected Category will be displayed in the product Data Grid View.
The templates shipped with Visual Studio or downloaded from the Visual Studio gallery are intended for general purpose use.
This means that the entities generated from these templates have simple ICollection properties.
When using POCO entity types, EF achieves lazy loading by creating instances of derived proxy types during runtime and then overriding virtual properties in your classes to add the loading hook.
To get lazy loading of related objects, you must declare navigation property getters as public and virtual (Overridable in Visual Basic), and you class must not be sealed (Not Overridable in Visual Basic).
If you are working in Visual Studio 2010 then you will need to update the EF designer to use EF6 code generation.
EF generates code from your model using T4 templates.
To do this we are going to extend Observable Collection to add IList Source functionality. If you completed the previous section (Option 1: Define a model using Code First), then skip this section and go straight to the Lazy Loading section.
and adds an explicit implementation of IList Source. Typically when you are targeting an existing database it will already be created, but for this walkthrough we need to create a database to access.
The model defines two types that participate in one-to-many relationship: Category (principal\master) and Product (dependent\detail).Tags: Adult Dating, affair dating, sex dating