Summarizing Keyword Combinations

Summarizing Keyword Combinations

The following table summarizes the various valid (yes) and invalid (no) keyword combinations.

Keyword	Interface	Abstract class	Class	Sealed class	struct
Abstract	no	yes	no	no	no
New	yes*	yes	yes	yes	no†
override	no	yes	yes	yes	no‡
private	no	yes	yes	yes	yes
protected	no	yes	yes	yes	no**
public	no	yes	yes	yes	yes
sealed	no	yes	yes	yes	no
virtual	no	yes	yes	no	no
*An interface can extend another interface and introduce a new method with the same signautre. †A struct implicitly derives from System.Object, which contains methods that the struct can hide. ‡A struct implicitly derives from System.Object, which contains no virtual methods. **A struct is implicitly sealed and cannot be derived from.

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