Change the data type of a Property of base class in derived class

[essamce]

hi, I want to Change the data type of a Property of base class in derived class like so

1. public abstract class A
2. {
4. public string Name { get; set; }
5. }
7. public abstract class B : A
8. {
10. public char[ ] Name { get; set; }
11. }

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