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The rest of this paper describes in detail the various elements that work together in order to make the sample above work.Every business application has, explicitly or implicitly, a conceptual data model that describes the various elements of the problem domain, as well as each element's structure, the relationships between each element, their constraints, and so on.Two innovations that make this move possible are Language-Integrated Query and the ADO. The Entity Framework exists as a new part of the ADO. An ideal environment for creation of business applications should allow developers to describe the business logic and state of the problem domain which they are modeling with minimum or no "noise" coming from the underlying representation and the infrastructure that supports it.Applications should be able to interact with the stores that maintain the persistent state of the system in the terms of the problem domain; specifically in the terms of a conceptual domain model, completely separated from the logical schema of the underlying store. NET Framework Language-Integrated Query Summary: Eliminate the impedance mismatch between data models and between languages that application developers would otherwise have to deal with new features available in the upcoming version of ADO. NET Entity Framework: Object Services LINQ to Entities: Language-Integrated Query References Appendix When one takes a look at the amount of code that the average application developer must write to address the impedance mismatch across various data representations (for example objects and relational stores) it is clear that there is an opportunity for improvement. NET Entity Framework: Modeling at the Rght Level of Abstraction ADO.When this property is set to Entity Deploy (the default value), three files are created from the file when a build is executed: the conceptual model file (.csdl), the storage model file (.ssdl), and the mapping file (.msl).

For information about other values of the Build Action property, see File Properties.For more information, see How to: Create a New File (Entity Data Model Tools). This section contains information that is used to generate model and mapping files for Entity Framework applications.Changes are made to an file when you use the Entity Designer to modify your model and when you use the Update Model Wizard to update your model based on changes to the underlying database. For more information, see the Build Action property in the File Properties section below.One would expect developers to be able to write something like the piece of code below: This is the class of expressiveness and abstraction level that ADO.NET, and in particular LINQ and the Entity Framework working together, brings to application development.

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