What is the advantage of static class over class ?

.1 When we have a normal class and its methods being used very frequently in a given app, then it would speed up things if we made this class a static class with static methods. This is because there is always a cost incurred in terms of resource usage ( CPU, memory, time) EVERY TIME a normal class is instantiated, whereas for static class its only a ONE-TIME cost when static constructor is FIRST called.

2. The main advantage of Static Classes come when there is a need to use WebMethod or a webservice, so that the application can call the static method without creating an object.

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Claims Class For security in .NET4.5 with C#

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