C#: How do you implement the visitor pattern?

1public interface IVisitor
2{
3    void Visit(Book book);
4    void Visit(Electronic electronic);
5}
6
7public interface IVisitable
8{
9    void Accept(IVisitor visitor);
10}
11
12public class PriceVisitor : IVisitor
13{
14    public decimal Total { get; private set; }
15    public void Visit(Book b) => Total += b.Price;
16    public void Visit(Electronic e) => Total += e.Price * 1.1m;
17}