asp.net mvc - Difficulty to start up with basic unit test (Sample from my book -- SportsStore) -

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i'm new in tdd and, actually, i'm trying follow sample book (sportsstore -- pro asp.net mvc framework/steve sanderson/apress). i'm on pages 103-105.

although there more on this, new of this, i'm concerned following statements.

productscontroller controller = new productscontroller(repository); var result = controller.list(2);      //...

regarding above statements, when write (as in book), 

var products = result.viewdata.model ilist<product>;

i compiler error "system.web.mvc.actionresult" not contain definition viewdata ..." but, when remove list() statement, compiler error disapear.

var result = controller.list(2);//doesn't work var result = controller;//it works

is wrong there? checked apress website book, there nothing listed errata or issue. so i'm lost.

thanks helping

that because actionresult not contains definition viewdata howerver viewresult , viewresult actionresult can cast (viewresult) , viewdata


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