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Company Name For Each customer In company Name Query Console. Northwnd nw = new Northwnd(@"northwnd.mdf"); Customer cust = new Customer(); cust. Dim nw As New Northwnd("c:\northwnd.mdf") Dim city Name Query = _ From cust In nw. Complex mapping, such as mapping an entity class to multiple tables, is not supported.However, you can map an entity class to a view that joins multiple related tables.

LINQ to SQL classes that are mapped to database tables and views are called .The O/R Designer generates the classes and applies the specific LINQ to SQL attributes to enable LINQ to SQL functionality (the data communication and editing capabilities of the Data Context).For detailed information about LINQ to SQL classes, see The LINQ to SQL Object Model.To create an update-able view, you must modify the wizard (or other tool) generated XML file (data model).Each time you generate a new data model (for example when the schema changes), you will need to reapply these steps.Dragging tables or views from Server Explorer/Database Explorer onto the O/R Designer creates entity classes in addition to the Data Context methods that are used for performing updates.By default, the LINQ to SQL runtime creates logic to save changes from an updatable entity class back to the database.LINQ to SQL itself translates all the necessary operations into the necessary SQL operations that you are familiar with. In the following example, the company names of customers from London are retrieved and displayed in the console window. Northwnd nw = new Northwnd(@"northwnd.mdf"); // or, if you are not using SQL Server Express // Northwnd nw = new Northwnd("Database=Northwind; Server=server_name; Integrated Security=SSPI"); var company Name Query = from cust in nw. The Visual Studio edition that you have and the settings that you use determine these elements. ) is achieved by just writing a LINQ query in your own programming language, and then executing that query to retrieve the results.

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  1. The table may not have its primary key identified correctly in the mapping info, leaving LINQ to SQL to treat it as read-only, ignoring your changes.

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