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Converting null literal or possible null value to non-nullable type.

Possible null reference argument for parameter 'eventWaitHandle' in 'void WpfSingleInstance.ActivateFirstInstanceWindow(EventWaitHandle eventWaitHandle)'.

Nullability of reference types in type of parameter 'state' of 'void WpfSingleInstance.WaitOrTimerCallback(object state, bool timedOut)' doesn't match the target delegate 'WaitOrTimerCallback' (possibly because of nullability attributes).

Nullability of reference types in type of parameter 'source' of 'void HWHash.PollSensorData(object source, ElapsedEventArgs e)' doesn't match the target delegate 'ElapsedEventHandler' (possibly because of nullability attributes).

Unboxing a possibly null value.

Possible null reference return.

Possible null reference return.

Dereference of a possibly null reference.

Unboxing a possibly null value.