Updating data using linq to sql
It does this by translating language-integrated queries into SQL for execution by the database, and then translating the results back into objects defined by the application domain.
The application can manipulate the objects while LINQ to SQL stays in the background, tracking changes to the data automatically.
An instance of Db Entity Entry class providea access to information about a given entity and its state.
You can change the state of an entity to Added, Updated, or Deleted.
LINQ does not aim to circumvent a data abstraction layer at the database level, based on stored procedures; in fact it makes their use easier for the programmer.
This tutorial guides you through the process of creating a simple application powered by Linq Connect technology.
This makes your data access layer safer, faster, and greatly more convenient to design.
In this tutorial it is assumed that you already have the database objects created.
Here, we will see how to update a single Student entity (not entity graph). In this way, we can easily update a single entity using DBContext in the disconnected mode. Entry method returns an instance of DBEntity Entry for a specified Entity.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).To keep this article simple, we will use LINQ To SQL Classes to fetch data from database, so create LINQ To SQL Class by right clicking on the solution New Item.., it will open a dialog to add new item so select LINQ To SQL Classes and give name Open Sever Explorer from view menu and add your database, where you created your products table, say Northwind Drag Products table to the surface Our application structure is completed, now we will create our own controller.For purposes of this article, I will assume you have a basic working knowledge of LINQ, LINQ to SQL, or LINQ to Entities. According to the Microsoft Developer Network (MSDN), “Entity Framework (EF) is an object-relational mapper that enables .NET developers to work with relational data using domain-specific objects.” Essentially, it is a layer between your application code and your database which maps your C# classes to database tables.