on (C# Reference)

 

Updated: July 20, 2015

For the latest documentation on Visual Studio 2017 RC, see Visual Studio 2017 RC Documentation.

The on contextual keyword is used in the join clause of a query expression to specify the join condition.

The following example shows the use of on in a join clause.

            var innerJoinQuery =
                from category in categories
                join prod in products on category.ID equals prod.CategoryID
                select new { ProductName = prod.Name, Category = category.Name };

C# Reference
LINQ Query Expressions

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