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Compiler Error CS0666

'member' : new protected member declared in struct

A struct cannot be abstract and is always implicitly sealed. Because structs do not support inheritance, the concept of a protected member in a struct makes no sense. For more information, see Inheritance.

Example

The following sample generates CS0666:

// CS0666.cs  
class M  
{  
    static void Main()  
    {  
    }  
}  
  
struct S  
{  
    protected int x;   // CS0666  
}