Query Keywords (C# Reference)

This section contains the contextual keywords used in query expressions.

In This Section

Clause	Description
from	Specifies a data source and a range variable (similar to an iteration variable).
where	Filters source elements based on one or more Boolean expressions separated by logical AND and OR operators ( && or \|\| ).
select	Specifies the type and shape that the elements in the returned sequence will have when the query is executed.
group	Groups query results according to a specified key value.
into	Provides an identifier that can serve as a reference to the results of a join, group or select clause.
orderby	Sorts query results in ascending or descending order based on the default comparer for the element type.
join	Joins two data sources based on an equality comparison between two specified matching criteria.
let	Introduces a range variable to store sub-expression results in a query expression.
in	Contextual keyword in a join clause.
on	Contextual keyword in a join clause.
equals	Contextual keyword in a join clause.
by	Contextual keyword in a group clause.
ascending	Contextual keyword in an orderby clause.
descending	Contextual keyword in an orderby clause.