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The in keyword identifies the collection to enumerate in a foreach loop.

The in keyword may also be used in a query, e.g., 'from item in dataset'. Immediately following the contextual keyword from is a range variable representing one item in the dataset. The dataset to be queried is defined immediately following the contextual keyword in. See also ascending, descending, in, orderby, select, and where.



C# 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 int interface
internal is lock long namespace
new null object operator out
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 var virtual
void volatile while
Special C# Identifiers (Contextual Keywords)
add alias async await dynamic
get global nameof partial remove
set value when where yield
Contextual Keywords (Used in Queries)
ascending by descending equals from
group in into join let
on orderby select where