The `DataContext.Add` method in C# is used to add an entity or multiple entities to the data context. This method allows for adding new objects to the data context's tracking mechanism, which keeps track of changes made to the entities. These changes can later be persisted to the database using the `DataContext.SaveChanges` method. The `Add` method takes one or more entities as parameters and appends them to the data context, making them part of the current session for CRUD operations.
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