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Compiler Error CS0743

Visual Studio 2008

Expected contextual keyword 'on'

The pattern for a join clause is join...in...on...equals, as shown in this example:

var query = from x in array1
            join y in array2 on x equals y
            select x;

To correct this error

  • Add the on keyword to the join clause.

The following code generates CS0743:

// cs0743.cs
using System;
using System.Linq;

public class C
{
    public static int Main()
    {
        int[] array1 = { 1, 2, 3 ,4, 5, 6,};
        int[] array2 = { 5, 6, 7, 8, 9 };
        var c = from x in array1
                join y in array2 x equals y // CS0743
                select x;
        return 1;
    }
}

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