Modifiers

Modifiers are used to modify declarations of types and type members. This section introduces the C# modifiers:

Modifier	Purpose
Access Modifiers public private internal protected	Specify the declared accessibility of types and type members.
abstract	Indicate that a class is intended only to be a base class of other classes.
const	Specify that the value of the field or the local variable cannot be modified.
event	Declare an event.
extern	Indicate that the method is implemented externally.
override	Provide a new implementation of a virtual member inherited from a base class.
readonly	Declare a field that can only be assigned values as part of the declaration or in a constructor in the same class.
sealed	Specify that a class cannot be inherited.
static	Declare a member that belongs to the type itself rather than to a specific object.
unsafe	Declare an unsafe context.
virtual	Declare a method or an accessor whose implementation can be changed by an overriding member in a derived class.
volatile	Indicate that a field can be modified in the program by something such as the operating system, the hardware, or a concurrently executing thread.