using System;

using System.Collections.Generic;

public class Program

{

    public static void Main()

    {

        var stackedEx = new Queue<string>();

        var testEx = new Exception("1st Exc.", 

            new AccessViolationException("2.nd Exc.", 

                new AggregateException("3rd Exc.", 

                    new ApplicationException("4th Exc."))));

        var innerEx = testEx.FlattenInnerException();

        //ExceptionHelper.PropagateInnerException(testEx, out stackedEx);

        foreach(var e in innerEx)

        {

            Console.WriteLine(e.Message);

        }

    }

}

​

public static class ExceptionHelper

{

    public static IEnumerable<Exception> FlattenInnerException(this Exception ex)

    {

        if (ex == null)

        {

            throw new ArgumentNullException("ex");

        }

​

        var innerException = ex;

        do

        {

            yield return innerException;

            innerException = innerException.InnerException;

        }

        while (innerException != null);

    }

}

​

/*

public static class ExceptionHelper

{

    public static void PropagateInnerException(Exception ex, out Queue<string> stackedMessage)

    {

        stackedMessage.Enqueue(ex.Message);

        IterateInnerException(ex, out stackedMessage);

    }

    #region Helpers

        private static void ItearateInnerEception(Exception ex, out Queue<string> stackedMessage)

        {

            stackedMessage.Enqueue(ex.Message);

            ItearateInnerEception(ex, out stackedMessage);

        }

    #endregion

}*/