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

Exception is just a class like many other classes in .Net. There're, IMHO, two tricky things with user defined exceptions:

1. Inherit your exception class from Exception, not from obsolete ApplicationException
2. User defined exception should have many constructors - 4 in the typical case

Something like that:

public class NegativeNumberException: Exception {
  /// 

  /// Just create the exception
  /// 
  public NegativeNumberException()
    : base() {
  }

  /// 

  /// Create the exception with description
  /// 
  /// Exception description
  public NegativeNumberException(String message)
    : base(message) {
  }

  /// 

  /// Create the exception with description and inner cause
  /// 
  /// Exception description
  /// Exception inner cause
  public NegativeNumberException(String message, Exception innerException)
    : base(message, innerException) {
  }

  /// 

  /// Create the exception from serialized data.
  /// Usual scenario is when exception is occured somewhere on the remote workstation
  /// and we have to re-create/re-throw the exception on the local machine
  /// 
  /// Serialization info
  /// Serialization context
  protected NegativeNumberException(SerializationInfo info, StreamingContext context)
    : base(info, context) {
  }
}