A class is the most common kind of reference type.
The class is the blue print for objects.
The simplest possible class declaration is as follows:
class YourClassName {
}
Preceding the keyword class we can add Attributes and class modifiers to the class.
The non-nested class modifiers are public, internal, abstract, sealed, static, unsafe, and partial.
Following YourClassName we can add Generic type parameters, a base class, and interfaces.
Within the braces Class members we can define methods, properties, indexers, events, fields, constructors, overloaded operators, nested types, and a finalizer.
A class can be marked static, indicating that it must be composed solely of static
members and cannot be subclassed.
The System.Console and System.Math classes are examples of static classes.