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Static class in C#

In C#, a static class is a class that cannot be instantiated and can only contain static members. This means you cannot create an object of a static class, and all its members (methods, properties, fields, etc.) must be static. Key Features of Static Classes: No Instantiation: You cannot create an instance of a static class using the new keyword. Static Members Only: All members of a static class must be static. Sealed: Static classes are implicitly sealed, meaning they cannot be inherited. No Instance Constructors: Static classes cannot have instance constructors, but they can have a static constructor. Example: Here's an example of a static class in C#: public static class MathUtilities { public static double Add(double a, double b) { return a + b; } public static double Subtract(double a, double b) { return a - b; } public static double Multiply(double a, double b) { return a * b; } public static double Divide(double a, double b) { if (b == 0) { throw new DivideByZeroException("Division by zero is not allowed."); } return a / b; } } Usage: You can call the methods of a static class directly using the class name, without creating an instance: double sum = MathUtilities.Add(5, 3); double difference = MathUtilities.Subtract(5, 3); double product = MathUtilities.Multiply(5, 3); double quotient = MathUtilities.Divide(5, 3); Benefits: Utility Functions: Static classes are ideal for utility or helper methods that do not require any object state. Performance: Since static members are accessed directly via the class name, they can be slightly faster than instance members.