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Static Class: A class that only contains static components and no instance components is referred to as a static class. Singleton Class: It is a class which does not allow you to create multiple instances.
A static field is associated with a type, whereas an instance variable is associated with an instance. using Personnel.Data; class Employee { private static DataSet ds; public string Name; public decimal Salary; ... shows an Employee class that has a private static variable and two public instance variables.