Static class

Below are some important point to consider for static classes.

• Contains only static member (properties also)
• Can not be instantiated
• Static class is sealed
• Can not contain Instance constructor (can contain static constructior)

* Instance constructor used to create & initialize any instance member when we use new to create object hence static class can not have  Instance constructor.

* Difference between sealed and static class is instance creation (sealed can contain static as well as non static)