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Query keywords (C# Reference)

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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 subexpression 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.

See also