Concurrency
LINQ to SQL has built-in support for optimistic concurrency; an entity is able to be retrieved and used in more than one operation at a time. When an entity is retrieved from the database, and then updated, if changes by another party occur in the interim, they are identified and a conflict is detected.
The mechanism supporting this feature is configured using two Column attribute properties: IsVersion and UpdateCheck.
IsVersion allows you to designate an entity class member to be used for optimistic concurrency control (OCC). Before committing a change to an entity, the data context verifies that no other transaction has modified its data. If the check reveals conflicting modifications, the committing transaction rolls back and ...
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