// In part, reproduced from the book "C# to the Point"

using System;

[AttributeUsage(AttributeTargets.Method | 
                AttributeTargets.Property)]
public sealed class MyObsoleteAttribute: Attribute{
  string message;
  bool isError;

  public string Message{
    get {
      return message;
    }
  }

  public bool IsError{
    get {
      return isError;
    }
    set {
      isError = value;
    }
  }

  public MyObsoleteAttribute(){
    message = ""; isError = false;
  }

  public MyObsoleteAttribute(string msg){
    message = msg; isError = false;
  }

  public MyObsoleteAttribute(string msg, bool error){
    message = msg; isError = error;
  }

}