C# How to add a property setter in derived class?

Question

I have a requirement where I have a number of classes all derived from a single base class. The base class contains lists of child classes also derived from the same base c

Answer 1

I ended up changing the way I handled it and leaving the set in the base class however rather than having the base class getter / setter do nothing I threw a NotImplemented / NotSupported exception.

public class BaseClass
{
  private BaseClass _Parent;
  public virtual decimal Result
  {
     get
     {
      if (Parent == null)
        throw new NotImplementedException("Result property not valid");

      return Parent.Result;
    }
    set
    {
      throw new NotSupportedException("Result property cannot be set here");
    }
  }
}

public class DerivedClass : BaseClass
{
  private decimal _Result;
  public override decimal Result
  {
    get { return _Result; }
    set { _Result = value;  }
  }
}