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But suppose the following occurs: Unless some validations are performed at the last step, the intermediate change (the one performed by another user) will be lost.To detect such situations, Linq Connect checks not only the primary key in the 'where' clause of update and delete commands, but the values of other columns as well.That's fine if you use LINQ directly in your UI code but it's not all that great if you use LINQ in the middle tier.Incidentally Rob Connery also mentioned this in his LINQ Sonic Cast last week.Let's describe such a situation in more details: In this case, the intermediate change (the one performed by another user) may be lost or corrupt.

I am assuming, you already know how to create dbml/linq to sql classes: Being Lin Q as a ORM, it’s quite easy and sql syntax free way to insert data using Lin Q.But for the application, the object state not being saved is clearly an error, so Linq Connect throws Change Conflict Exception (the text is usually "Row not found or changed.").If you do want to throw away all changes except the latest ones in such situations, or are sure that your application will be the only client of the database, you can disable all update checks to have no concurrency exceptions on submits and also some performance gain (because update commands become simpler and have less parameters).One problem that I can't seem to resolve with the data context is how to update Entities based on POCO objects that didn't originate out of the Data Context.LINQ wants to manage all objects through its data context which basically manages change tracking for any entities - any changes you make can later be persisted.

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