Modern language elements
Write a string store class to manage string value in a membervariablenamed string. Thevariable’s value should be setable and retrievable using a propertynamed Data. The string store class must also publish an event whichis emitted if the data field’s value is changed to null. The eventmust provide the number of times the value was changed to null(including the current case) as its parameter. The event should notbe emitted if the previous value was also null.
Provide the complete c# code of the String store class as wellas a short code snippet that creates an instance of it. Subscribesto the event
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