![]() NET applications, such as ASP.NET MVC which allows these applications to leverage the same annotations for client-side validations. DataAnnotations are also understood by a number of. The above code will execute the following UPDATE statement in the database. DataAnnotations is used to configure the classes which will highlight the most commonly needed configurations. using( var context = new SchoolContext()) This timestamp column will be included in the where clause whenever you update an entity and call the SaveChanges method. 5 minutes to read 1 contributor Feedback In this article Where to get mapping attributes RequiredAttribute ForeignKeyAttribute InversePropertyAttribute DeleteBehaviorAttribute Mapping attributes are used to modified or override the configuration discovered by model building conventions. So, EF will create a column named RowVersion with timestamp data type in the Students table in the SQL Server database, as shown below. ![]() In the above example, the Timestamp attribute is applied to the byte property of the Student entity. It creates a column with timestamp data type in the SQL Server database.Įntity Framework API automatically uses this Timestamp column in concurrency check on the UPDATE statement in the database. ![]() It can only be applied once in an entity class to a byte array type property. By Code-First convention, Entity Framework creates a column for every public property that is of a supported data type and has both a getter and a setter. The Concurrency issue arises when multiple users attempt to update/delete the same row at the same time. Next Data Annotations - Timestamp Attribute in EF 6 & EF CoreĮF 6 and EF Core both include the Timestamp data annotation attribute. By convention, when using a relational database, entity properties are mapped to table columns having the same name as the property. Databasegenerated Attribute Using the Timestamp attribute in Entity Framework (EF) is one of the ways to handle the Concurrency issues.
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