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I have created a dbml file in my project, and then dragged two tables from a database into the designer. This is the tables for order header and order lines, and order lines have a foreign key to order header to make it a one to many relationship.
As soon as the two tables are dragged onto the designer, the association arrow appear and everything looks correctly. In the properties for the association, Child Property is set to True, Access is public, Inheritance mode is (none), Name is OrderLines (originally taOrderLines, but edited by me to be called OrderLines.
The problem is that no OrderLines property is created. I checked manually in the generated cs file also, and neither the word OrderLines or Association is found there.
What am I doing wrong here?
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The DBML file is mapping that defines your classes based on your database schema. Yes, it defines your (default) connection string, but it doesn't "configure" your database at all. Linq to Sql uses a database-first approach where you have the database and model your classes after the DB schema.
edmx is the modeling file for Entity Framework. dbml is the modeling file for Linq 2 Sql. You should spend your time learning Entity Framework as Linq 2 Sql is deprecated.
LINQ to SQL allow you to query and modify SQL Server database by using LINQ syntax. Entity framework is a great ORM shipped by Microsoft which allow you to query and modify RDBMS like SQL Server, Oracle, DB2 and MySQL etc. by using LINQ syntax. Today, EF is widely used by each and every .
Make sure each class has a primary key.
If your objects don't have a Primary Key property in the dbml, LinqToSql object tracking can't see those objects and relational properties will not be generated.
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