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Compiler Warning (level 4) CS0628 

Error Message

'member' : new protected member declared in sealed class

A sealed class cannot introduce a protected member because no other class will be able to inherit from the sealed class and use the protected member.

The following sample generates CS0628:

// CS0628.cs
// compile with: /W:4
sealed class C
   protected int i;   // CS0628

class MyClass
   public static void Main()

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