public static string ToFormattedString(this System.Exception exception)
{
IEnumerable <string> messages = exception
.GetAllExceptions()
.Where(e => !System.String.IsNullOrWhiteSpace(e.Message))
.Select(exceptionPart => exceptionPart.Message.Trim() + "\r\n" + (exceptionPart.StackTrace != null ? exceptionPart.StackTrace.Trim() : ""));
string flattened = System.String.Join("\r\n\r\n", messages); // <-- the separator here
return(flattened);
}