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