The CrmMetal utility is used to generate a CRM Data Context class as well as data transfer object (DTO) classes for all CRM entities. This mechanism follows the same design pattern as SqlMetal implements in the Entity Framework. The data context class is responsible for all data operations as well as to give IQueryable interfaces for all entities in CRM. Data retrieval is done through performing LINQ queries against the IQueryable entity set properties. Data changes are handled by the AddObject, DeleteObject, UpdateObject and SaveChanges methods.
The ADXSTUDIO xRM SDK contains a pre-generated data context for the out-of-the-box CRM entities plus our basic customizations. This data context class and the DTO classes can be used by your application to access the CRM entities and properties that have not been customized. If you have customized your entities, you should generate your own data context and DTO classes with the CrmMetal utility.