AsyncWorker - A Typesafe BackgroundWorker (and about Threading in General)

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Runtime.Serialization;

namespace System {
   /// <summary>
   /// this Exception is not meant to be handled. Only for logging and debugging-purposes
   /// </summary>
   [Serializable]
   public class BugException : Exception {
      public BugException(string message) : base(message) { }
      protected BugException(SerializationInfo info, StreamingContext context)
         : base(info, context) { }
      public BugException(string message, Exception innerException)
         : base(message, innerException) { }
   }
   public static class BugExceptionX {
      // these extensions automatically add type-informations to the messages. Furthermore they concat
      //�lists of anything to the message
      public static BugException BugException<T>(
            this T sender, params string[] messages) where T : class {
         return new BugException(string.Concat(sender.ToString(), "\n", string.Concat(messages)));
      }
      public static BugException BugException<T>(
         this T sender, Exception innerEx, params string[] messages) where T : class {
         return new BugException(
            string.Concat(sender.ToString(), "\n", string.Concat(messages)), 
            innerEx);
      }
   }
}