Debug Tracing and Asserts

I'm a raw noob when it comes to using these functions, but feel a need to
introduce some controls and audit in my current project.  It is littered
with null checks, which mostky do nothing if a component is missing, i.e. a
property is null after deserialising because the XML element that represents
it was missing.



I now have reached a stage where, downstream, I get null reference errors,
and I have to trace all the way down the stream, from the spring, so see
where and why my property is null.  Could somebody please recommend a good
resource on using the features provided by .NET to assist in diagnosing and
auditing these scenarios?


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