Keywords

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Keywords are reserved words predefined to the C# compiler. These keywords cannot be used as identifiers. However, if you want to use these keywords as identifiers, you may prefix the keyword with the @ character. The following table lists the reserved keywords in C#:

Reserved Keywords
abstract	as	base	bool	break	byte
case	catch	char	checked	class	const
continue	decimal	default	delegate	do	double
else	enum	event	explicit	extern	false
finally	fixed	float	for	foreach	goto
if	implicit	in	in (generic modifier)	int	interface
internal	is	lock	long	namespace	new
null	object	operator	out	out (generic modifier)	override
params	private	protected	public	readonly	ref
return	sbyte	sealed	short	sizeof	stackalloc
static	string	struct	switch	this	throw
true	try	typeof	uint	ulong	unchecked
unsafe	ushort	using	virtual	void	volatile
while

In C#, some words having special meaning in context of code, such as get and set, are called contextual keywords and can be used as identifiers outside that context. Generally, as new keywords are added to the C# language, they are added as contextual keywords in order to avoid breaking programs written in earlier versions. The following table lists the contextual keywords in C#:

Contextual Keywords
add	alias	ascending	descending	dynamic	from
get	global	group	into	join	let
orderby	partial (type)	partial (method)	remove	select	set