using System;

using System.Collections.Generic;

​

public class Program

{

    public static void Main(string[] args)

        {

            MyPair mypair = new MyPair() { Value1 = 10, Value2 = 20 };

​

            List<MyPair> myPairs = new List<MyPair>();

            myPairs.Add(mypair);

​

            myPairs.Add(new MyPair(2, 10));

            myPairs.Add(new MyPair(3, 30));

​

            MyPair rollingSum = new MyPair();

​

            foreach (MyPair myPair in myPairs)

            {

                rollingSum.Value1 += myPair.Value1;

                rollingSum.Value2 += myPair.Value2;

                Console.WriteLine($"rolling sum: {rollingSum.Value1}, {rollingSum.Value2}");

            }

​

            Console.WriteLine($"rolling sum: {rollingSum.Value1}, {rollingSum.Value2}");

            Console.ReadLine();

        }

​

        class MyPair

        {

            public MyPair()

            { }

            public MyPair(int value1, int value2)

            {

                Value1 = value1;

                Value2 = value2;

            }

            public int Value1 { get; set; }

            public int Value2 { get; set; }

        }

}