private StringBuilder BuildExceptionDetail(Exception ex, StringBuilder sb)
    {
        sb.AppendLine("Message: " + ex.Message);
        sb.AppendLine("Source: " + ex.Source);
        sb.AppendLine("TargetSite: " + ex.TargetSite);
        sb.AppendLine("StackTrace: " + ex.StackTrace);

        // loop recursivly through the inner exception if there are any.
        if (ex.InnerException != null)
        {
            sb.AppendLine("InnerException: ");
            BuildExceptionDetail(ex.InnerException, sb);
        }

        return sb;
    }