Select - Indexed

Query

public void Linq12()
{
    int[] numbers = { 5, 4, 1, 3, 9, 8, 6, 7, 2, 0 };
  
    var numsInPlace = numbers.Select((num, index) => new { Num = num, InPlace = (num == index) });
  
    Console.WriteLine("Number: In-place?");
    foreach (var n in numsInPlace)
    {
        Console.WriteLine("{0}: {1}", n.Num, n.InPlace);
    }
}

Lambda Expression

public void DataSetLinq12()
{
    var numbers = testDS.Tables["Numbers"].AsEnumerable();
 
    var numsInPlace = numbers.Select((num, index) => new
    {
        Num = num.Field("number"),
        InPlace = (num.Field("number") == index)
    });
 
    Console.WriteLine("Number: In-place?");
    foreach (var n in numsInPlace)
    {
        Console.WriteLine("{0}: {1}", n.Num, n.InPlace);
    }
}