What do you want to achieve exactly? How are you generating the context ? Have you used the 'Database First' approach to import all tables into the designer and then use the generated context class? Such a context class should have a property that returns IQueryable<T> for each persistent type in your model.
In case you want to get an extent by specifying the persistent type name, you can add a partial class for the context class and add the following method to it
Do send me some more information on what you want to achieve and i would be glad to assist you further.
the Telerik team
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