foreach(object o in new int[] { 1,2,3 })
     ....

foreach(Person p in new object[] { ... })
     ....

namespace Iterating_types
    {
    using System;
    using System.Collections.Generic;
    using System.Diagnostics;
    using System.Linq;
    using System.Text;
class Program
    {
        static void Main(string[] args)
        {
            Thread.CurrentThread.Priority = ThreadPriority.Highest;
            Process.GetCurrentProcess().PriorityClass = ProcessPriorityClass.RealTime;

            Stopwatch watch = new Stopwatch();
            int UPPER = 1000000;
            int[] int_arr = Enumerable.Range(1, UPPER).ToArray();
            List<int> int_list = Enumerable.Range(1, UPPER).ToList();

            Int32[] int32_arr = Enumerable.Range(1, UPPER).ToArray();

            Int64[] int64_arr = new Int64[UPPER];

            IntObject[] intobject_arr = new IntObject[UPPER];
            List<IntObject> intobject_list = new List<IntObject>();

            string[] string_arr = new string[UPPER];
            List<string> string_list = new List<string>();

            bool[] bool_arr = new bool[UPPER];
            Boolean[] boolean_arr = new Boolean[UPPER];
            List<bool> bool_list = new List<bool>();
            List<Boolean> boolean_list = new List<Boolean>();
            // Initializing some of the above
            for (int i = 0; i < UPPER; i++)
            {
                int64_arr[i] = (Int64) i;
                string_arr[i] = i.ToString();
                string_list.Add(i.ToString());
                intobject_arr[i] = new IntObject(i);
                intobject_list.Add(new IntObject(i));
                bool_arr[i] = (i%2 ==0);
                boolean_arr[i] = (i%2 ==0);
                bool_arr[i] = (i%2 ==0);
                bool_list.Add(i%2 ==0);

                boolean_list.Add(i%2 == 0);
            }

            Console.WriteLine("Iterations: {0}{1}", UPPER, Environment.NewLine);
            Console.WriteLine("Thread priority: {0}", Thread.CurrentThread.Priority);
            Console.WriteLine("Process priority: {0}", Process.GetCurrentProcess().PriorityClass);

            Console.WriteLine("nrArrays:t----------------------------------------------");

            bool b;
            b = bool_arr[1];
            watch.Start();
            for (int i = 0; i < UPPER; i++)
            {
                b = bool_arr[i];
            }
            watch.Stop();
            Console.WriteLine("Type: booltStructure: Arraytticks: {0}tMiliSeconds:{1}", watch.ElapsedTicks, watch.ElapsedMilliseconds);

            watch.Start();
            for (int i = 0; i < UPPER; i++)
            {
                b = boolean_arr[i];
            }
            watch.Stop();
            Console.WriteLine("Type: BooleantStructure: Arraytticks: {0}tMiliSeconds:{1}", watch.ElapsedTicks, watch.ElapsedMilliseconds);

            int temp_int;
            temp_int = int_arr[1];
            watch.Start();
            for (int i = 0; i < UPPER; i++)
            {
                temp_int = int_arr[i];
            }
            watch.Stop();
            Console.WriteLine("Type: InttStructure: Arraytticks: {0}tMiliSeconds:{1}", watch.ElapsedTicks, watch.ElapsedMilliseconds);

            Int32 temp_int32 ;
            temp_int32 = int32_arr[1];
            watch.Reset();
            watch.Start();
            for (int i = 0; i < UPPER; i++)
            {
                temp_int32 = int32_arr[i];
            }
            watch.Stop();
            Console.WriteLine("Type: Int32tStructure: Arraytticks: {0}tMiliSeconds:{1}", watch.ElapsedTicks, watch.ElapsedMilliseconds);

            Int64 temp_int64 ;
            temp_int64 = int64_arr[1];
            watch.Reset();
            watch.Start();
            for (int i = 0; i < UPPER; i++)
            {
                temp_int64 = int64_arr[i];
            }
            watch.Stop();
            Console.WriteLine("Type: Int64tStructure: Arraytticks: {0}tMiliSeconds:{1}", watch.ElapsedTicks, watch.ElapsedMilliseconds);

            string s ;
            s = string_arr[1];
            watch.Reset();
            watch.Start();
            for (int i = 0; i < UPPER; i++)
            {
                s = string_arr[i];
            }
            watch.Stop();
            Console.WriteLine("Type: stringtStructure: Arraytticks: {0}tMiliSeconds:{1}", watch.ElapsedTicks, watch.ElapsedMilliseconds);

            temp_int = intobject_arr[1].IntValue;
            watch.Reset();
            watch.Start();
            for (int i = 0; i < UPPER; i++)
            {
                temp_int = intobject_arr[i].IntValue;
            }
            watch.Stop();
            Console.WriteLine("Type: IntObjecttStructure: Arraytticks: {0}tMiliSeconds:{1}", watch.ElapsedTicks, watch.ElapsedMilliseconds);

            Console.WriteLine("nrLists:t----------------------------------------------");

            watch.Reset();
            watch.Start();
            foreach (var val in bool_list)
            {
                b = val;
            }
            watch.Stop();
            Console.WriteLine("Type: booltStructure: Listttticks: {0}tMiliSeconds:{1}", watch.ElapsedTicks, watch.ElapsedMilliseconds);

            watch.Reset();
            watch.Start();
            foreach (var val in boolean_list)
            {
                b = val;
            }
            watch.Stop();
            Console.WriteLine("Type: BooleantStructure: Listttticks: {0}tMiliSeconds:{1}", watch.ElapsedTicks, watch.ElapsedMilliseconds);

            temp_int = int_list.First();
            watch.Reset();
            watch.Start();
            foreach (var val in int_list)
            {
                temp_int = val;
            }
            watch.Stop();
            Console.WriteLine("Type: InttStructure: Listttticks: {0}tMiliSeconds:{1}", watch.ElapsedTicks, watch.ElapsedMilliseconds);

            s = string_list.First();
            watch.Reset();
            watch.Start();
            foreach (var val in string_list)
            {
                s = val;
            }
            watch.Stop();
            Console.WriteLine("Type: stringtStructure: Listttticks: {0}tMiliSeconds:{1}", watch.ElapsedTicks, watch.ElapsedMilliseconds);

            temp_int = intobject_list.First().IntValue;
            watch.Reset();
            watch.Start();
            foreach (var val in intobject_list)
            {
                temp_int = val.IntValue;
            }
            watch.Stop();
            Console.WriteLine("Type: IntObjecttStructure: Listttticks: {0}tMiliSeconds:{1}", watch.ElapsedTicks, watch.ElapsedMilliseconds);

            Console.WriteLine();
            Console.WriteLine("Hit any key to exit.");
            Console.ReadKey();


        }
    }

    class IntObject
    {
        public int IntValue { get; set; }

        public IntObject ()
        {
            IntValue = 0;
        }

        public IntObject(int i)
        {
            IntValue = i;
        }
    }
}

List