Shared Fields
Shared fields are useful to store information that is common to all instances of a class. For example, imagine you have a class named Document and that represents a text document. You could implement a shared field acting as a counter of all the documents opened in your application:
The code in the example increments the counter each time a new instance is created. The documentCounter field is common to all instances of the Document class because it is marked with the Shared keyword.
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