C#: Sorting with anonymous function -

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Let's say I have a list of objects, and I want to sort it according to the date dated property. Why can not one use a representative? How do I sort them by date dated if not as shown below: 

  Sort public stringDated (list & gt; CartItem & gt; items) {items.Sort (new function & quot; Cart item, Cart item, Bold & gt; ((itemA, Item B) = & gt; {Return Item A.Detted; Item BaidDate;});); }

Why not use lambda expressions? 

  public string sorted by date (list & gt; item); items (. (A, b) = & gt; a.DateModified.CompareTo (b.DateModified)); }

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