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Indexers are always created with this keyword.
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Parameterized property are called indexer.
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Indexers are implemented through get and set
accessors for the [ ] operator.
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ref and out parameter modifiers are not
permitted in indexer.
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Indexer is an instance member so can't be static
but property can be static.
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Indexers are used on group of elements.
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Indexer can be overloaded.