http://net-informations.com/faq/netfaq/singlestatic.htm
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In simple words, Singleton is a pattern and not a keyword. The
Singleton pattern has several advantages over static classes. A
singleton allows a class for which there is just one, persistent
instance across the lifetime of an application. That means, it
created a single instance and that instance (reference to that
instance) can be passed as a parameter to other methods, and
treated as a normal object. While a static class allows only
static methods and and you cannot pass static class as parameter.
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