Nulls Explained

In this page we'll Demo and explain:

null is a special value that indicates that there is no value
null is different than '0' or '"";
if a member value was not set, it's value is null
Explain that when you get the "Object reference not set to an instance of an object" exception, it means that you are trying to use a field that has a null value - it's value was not set.
Not all types can have a null value, for example int, bool, and DateTime can not havea a null value because they are structs

string s = null;

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