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An instance of the Object Context class encapsulates the connection to the database, metadata that describes the model, and an Object State Manager object that tracks objects during create, update, and delete operations.
For a complete description of changes that are made by the update model wizard, please see the "Changes Made to an File by the Update Model Wizard" link above.
For a guide on submitting good bug reports, read Painless Bug Tracking.
BTW this is a canned response and may have info or details that do not directly apply to this particular issue.
Contexts and Entities in EDMX play a vital role and you must understand the purpose of these.
Context contains all the logic for interacting with database and Entities represent database tables.