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The Northwind Data Context class has properties that represent each Table we modeled within the database (specifically: Products, Categories, Customers, Orders, Order Details).
As I covered in Part 3 of this blog series, we can easily use LINQ syntax expressions to query and retrieve data from our database using this Northwind Data Context class.
LINQ to SQL is a built-in O/RM (object relational mapper) that ships in the .
Over the last few weeks I've been writing a series of blog posts that cover LINQ to SQL.
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.
I'll also show how we can cleanly integrate business rules and custom validation logic with our data model.
Note that if a Product's property values weren't changed by the property assignments above, then the object would not be considered changed and LINQ to SQL would therefore not execute an update for that product back to the database.
For example - if the "Chai" product's unitprice was already and the number of units in stock was 4, then calling Submit Changes() would not cause any database update statements to execute.
In Part 2 of this series I walked through how to create a LINQ to SQL class model using the LINQ to SQL designer that is built-into VS 2008.