c# - Sort generic list descending order -

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i have method in controller 

   public actionresult index()     {         return view(db.posts.tolist());     }

how can list in descending order? instead of starting id:1 starts @ last id in table

public actionresult index()     {         return view(db.posts.orderbydescending(p => p.id).tolist());     }

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