You can see part 1 here, part 2.1 here, part 2.2 here, part 2.3 here, part 2.4 here, part 2.5 here, part 2.6 here and part 2.7 here.
You will need this a lot when assigning nullable value or object value to one of the value types. We use the "??" to replace "?:" in some cases. Let's see this e...
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