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on (C# Reference)

Visual Studio 2012

Visual Studio 2010
Visual Studio 2008

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 };

Concepts

LINQ Query Expressions (C# Programming Guide)

Other Resources

C# Reference

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