Access Modifiers in C#.NET

Public

Member can be accessed by any other code in the same assembly or from another assembly that reference it.

Private

Member can only be accessed by the code in the same class or struct.

Protected

Member can be accessed by the code in the same class or struct and also by the code in a derived class.

Internal

Member can be access by the code in the same assembly but not by the code in a different assembly.

Protected internal

Member can be accessed by the code in the same assembly or the code in another assembly which inherits the class.

Static

Static classes cannot be instantiated and all the members are static. If the method is static and the class is not static then the method can be accessed without creating a instance of the class.