Linqpad microbenchmark of Foreach vs Select.

SelectMicroBenchmark.Linq.cs

void Main()
{
    var fooList = Enumerable.Range(0, 1000).Select( n => new Foo { Bar = "Bar" + n.ToString() } ).ToList();
    
    ForeachTest(fooList);
    LinqTest(fooList);
    
    var timer = Stopwatch.StartNew();
    
    for(int i = 0; i < 100000; i++)
    {
        ForeachTest(fooList);
    }
    
    timer.Stop();
    var test1 = timer.Elapsed;
    
    timer.Restart();
    
    for(int i = 0; i < 100000; i++)
    {
        LinqTest(fooList);
    }
    
    timer.Stop();
    var test2 = timer.Elapsed;
    
    Console.WriteLine("Foreach loop test ran in {0}", test1);
    Console.WriteLine("Linq test ran in {0}", test2);
    Console.WriteLine("Difference between Foreach and Linq {0}", test2.Subtract(test1));
}

private static void ForeachTest(List<Foo> fooList)
{
    var barList = new List<string>(fooList.Count);
        
    foreach(var item in fooList)
    {
        barList.Add(item.Bar);
    }
}

private static void LinqTest(List<Foo> fooList)
{
    var barList = fooList.Select(x => x.Bar).ToList();
}

public class Foo
{
    public string Bar { get; set; }
}