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When working with Web applications, use a context instance per request.
When working with Windows Presentation Foundation (WPF) or Windows Forms, use a context instance per form.
If it is your first MVC project then check the structure of application, Content (contains theme and css files), Controllers (contains our controller classes), Models (Models to use in view to pass values from page to controllers) and Views (page UI).
So in this article we will see how to select records from database (with Web Grid, pagination and sort functionality), update a record, add new record and finally delete a record in ASP. Let’s create a simple table Products with very basic columns for now, here is the table structure: CREATE TABLE [Products]( [Product Id] [int] IDENTITY(1,1) NOT NULL, [Product Name] [varchar](50) NOT NULL, [Price] [decimal](18, 2) NOT NULL, [Qunatity] [int] NOT NULL, [Reorder Level] [int] NOT NULL, CONSTRAINT [PK_Products_1] PRIMARY KEY CLUSTERED ( [Product Id] ASC )WITH (PAD_INDEX = OFF, STATISTICS_NORECOMPUTE = OFF, IGNORE_DUP_KEY = OFF, ALLOW_ROW_LOCKS = ON, ALLOW_PAGE_LOCKS = ON) ON [PRIMARY] ) ON [PRIMARY] GO Internet Application View engine: Razor Don’t create a unit test project; it is out of scope of this article.
There is no change-tracking, so you have to manage that yourself, but on the plus side you get more control and faster access to your data. A lot of times we need to write code that returns only a subset of the entire dataset.
We expand on the previous example to show what a product search function could look like.
This lets you use change-tracking functionality that context provides.https://msdn.microsoft.com/en-gb/data/jj729737Overwrite Changes: Objects that do not exist in the object context are attached to the context.
If an object is already in the context, the current and original values of object’s properties in the entry are overwritten with data source values.