extension methods - Casting and Linq Cast<T>() -

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While trying to answer, I searched the following: 

  string s = "Test"; Var result 1 = s.Select (c => (ushort) c); // work fine var result2 = s.Cast & lt; Ushort & gt; (); // An unlawful artist throws an exception

Why Cast & lt; T & gt; () here fails? What is the difference?

Think you will find your answer here:

IEnumerable & LT; T & gt; . This means that every time from time to time every value is delivered to the point where it is being inserted, it already has System.Object


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