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I covered how to construct and model these relationships in Part 2 of this blog series.LINQ to SQL enables me to take advantage of these relationships for both querying and updating my data.NET Framework 3.5 release, and which enables you to easily model relational databases using . You can use LINQ expressions to query the database with them, as well as update/insert/delete data.Below are the first three parts of my LINQ to SQL series: In today's blog post I'll cover how we we can use the data model we created earlier, and use it to update, insert, and delete data.Each instance of a class entity represents a row within the database table.
The Northwind Data Context class has properties that represent each Table we modeled within the database (specifically: Products, Categories, Customers, Orders, Order Details).
Just as I can express that I want to add a new Product to the database by adding a Product object into the Data Context's Products collection, I can likewise express that I want to delete a product from a database by removing it from the Data Context's Products collection: Note above how I'm retrieving a sequence of discontinued products that no one has ever ordered using a LINQ query, and then passing it to the Remove All() method on my Data Context's "Products" collection.
When we call "Submit Changes()" above all of these Product rows will be deleted from our products table.
This will cause LINQ to SQL to dynamically calculate and execute the appropriate SQL code to update the database.
For example, I could write the below code to update the price and # of units in stock of the "Chai" product in the database: When I call northwind.
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For example, I could write the below code to create a new Product and associate it with an existing "Beverages" category in my database like so: Note above how I'm adding the Product object into the Category's Products collection.