by (C# Reference)

The by contextual keyword is used in the group clause in a query expression to specify pecify how the returned items will be grouped.. For more information, see group clause (C# Reference).

Example

The following example shows the use of the by contextual keyword in a group clause to specify that the students should be grouped according to the first letter of the last name of each student.

var query = from student in students
            group student by student.LastName[0];

See Also

Concepts

LINQ Query Expressions (C# Programming Guide)

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