How can I map column name with different name to an entity class properties

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EF6.0

I want to map column name different from class name in Entity Framework 6.
Scenario:

I have a table named tbl_invoicedetails with column names
->invdetails_id
->item_name
->itemdetails

and so on

Model name InvDetails
->InvDetailsID
->ItemName
->ItemDetails

So I have to map both of them in OnModelCreating event. I've gone through Scott Gu's blog but that's not applicable for EF6. That is for EF4 or 4.1.

I also want to ask if data annotation is better or fluent api. Please provide an example or an ef 6 link...whatever possible.