make and operate on lots of classes and structs

gistfile1.cs

using System;
using System.Collections.Generic;
using ClassOrStruct;

namespace Runner
{
    class Program
    {
        private static readonly Random Random = new Random();
        private const int Capacity = 25000000;

        static void Main(string[] args)
        {
            AddObjectsTogether();
            AddStructsTogether();
        }

        private static void AddStructsTogether()
        {
            var endValues = new List<ValueStruct>(Capacity);

            foreach (var value in CreateABunchOfStructs())
            {
                endValues.Add(value + MakeRandomValueStruct());
            }
        }

        private static void AddObjectsTogether()
        {
            var endValues = new List<ValueClass>(Capacity);

            foreach (var value in CreateABunchOfObjects())
            {
                endValues.Add(value + MakeRandomValueClass());
            }
        }

        private static ValueStruct MakeRandomValueStruct()
        {
            return new ValueStruct(Random.NextDouble(), Random.NextDouble(), Random.NextDouble(), Random.NextDouble());
        }

        private static ValueClass MakeRandomValueClass()
        {
            return new ValueClass(Random.NextDouble(), Random.NextDouble(), Random.NextDouble(), Random.NextDouble());
        }

        private static IEnumerable<ValueStruct> CreateABunchOfStructs()
        {
            for (var i = 0; i < Capacity; i++)
            {
                yield return MakeRandomValueStruct();
            }
        }

        private static IEnumerable<ValueClass> CreateABunchOfObjects()
        {
            for (var i = 0; i < Capacity; i++)
            {
                yield return MakeRandomValueClass();
            }
        }
    }
}