From Java to C#: A Developer's Guide

6.1. Class modifiers

A C# class can have the modifiers listed in Table 6.1.

Table 6.1. Valid class modifiers in C#

Class modifier	Comments
new	Only applicable for nested (inner) classes – Non-nested classes cannot have a new modifier (see section 6.9)
abstract	Makes the class an abstract class (see section 6.8)
sealed	Makes the class a sealed class – a sealed class is a final class in Java-speak (see section 6.7)
public	Access modifiers – modify the accessibility of the class (see section 8.1)
protected
internal
private