creating my own exceptions c#

Question

Following examples in my C# book and I came across a book example that doesn\'t work in Visual Studio. It deals with creating your own exceptions, this one in particular is

Answer 1

Since .NET 3.0 custom exceptions should be derived from Exception and not ApplicationException, so use this:

public class NegativeNumberException : Exception
{ 
    public NegativeNumberException():base() { } 
    public NegativeNumberException (string message): base(message) { }
}