== Why is this an issue? Throwing such general exceptions as ``++Exception++``, ``++SystemException++``, ``++ApplicationException++``, ``++IndexOutOfRangeException++``, ``++NullReferenceException++``, ``++OutOfMemoryException++`` and ``++ExecutionEngineException++`` prevents calling methods from handling true, system-generated exceptions differently than application-generated errors. === Noncompliant code example [source,vbnet] ---- Public Sub DoSomething(obj As Object) If obj Is Nothing Then ' Noncompliant Throw New NullReferenceException("obj") End If ' ... End Sub ---- === Compliant solution [source,vbnet] ---- Public Sub DoSomething(obj As Object) If obj Is Nothing Then Throw New ArgumentNullException("obj") End If ' ... End Sub ---- include::../see.adoc[] ifdef::env-github,rspecator-view[] ''' == Implementation Specification (visible only on this page) === Message "XXX" should not be thrown by user code. ''' == Comments And Links (visible only on this page) include::../comments-and-links.adoc[] endif::env-github,rspecator-view[]