using System;

​

namespace MyProgram3

{

    public class Program

    {

        public static void Main(string[] args)

        {

            PersonInformation person = new PersonInformation { Name = "sara", PhoneNumber = "444-5309-334" };

            ref var name = ref GetName(person);

            MakeNameCapitalized(ref name);

            Console.WriteLine(person.Name); //Writes "SARA"

            Console.ReadLine();

        }

        public static ref string GetName(PersonInformation person)

        {

            return ref person.Name;

        }

        public static void MakeNameCapitalized(ref string name)

        {

            name = name.ToUpper();

        }

    }

    public class PersonInformation

    {

        public String Name;

        public String PhoneNumber;

    }

}

​