Updating records in a dataset vb net
For more information, see Generating Commands with Command Builders.
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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.
Below is a class model created for the Northwind sample database and which I'll be using in this blog post: When we designed our data model using the LINQ to SQL data designer above we defined five data model classes: Product, Category, Customer, Order and Order Detail.
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.
For example, I could write the below LINQ expression to retrieve a single Product object by searching on the Product name: I could then write the LINQ query expression below to retrieve all products from the database that haven't yet had an order placed for them, and which also cost more than 0: Note above how I am using the "Order Details" association for each product as part of the query to only retrieve those products that have not had any orders placed for them.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.When we perform queries and retrieve objects like the product instances above, LINQ to SQL will by default keep track of any changes or updates we later make to these objects.We can make any number of queries and changes we want using a LINQ to SQL Data Context, and these changes will all be tracked together.