public CallbackTraceFilter(ShouldTraceCallback shouldTraceCallback)
 {
     if (shouldTraceCallback == null)
     {
         throw new ArgumentNullException("shouldTraceCallback");
     }
     _shouldTraceCallback = shouldTraceCallback;
 }
 public CallbackTraceFilter (ShouldTraceCallback shouldTraceCallback)
 {
     if (shouldTraceCallback == null)
         throw new ArgumentNullException("shouldTraceCallback");
     _shouldTraceCallback = shouldTraceCallback;
 }