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There's a schema for your table.
The schema is connected to your Entity Framework class.
The Entity Framework class is connected to your JS model.
The JS model is connected to your store.
The view is connected to your store.
The grid is connected to your view.
The columns are connected to your grid....
...via the store which is connected to your JS model's definition of the EF class properties that is mapped to your database table's schema.
So, all told, you have to define:
The table schema
The EF class
The JS model
The grid columns
and the store-model-fields that each column maps to.