using System;

​

public class Program

{

    public static void addData(Data d, string addData)

    {

        d.addedData = addData;

    }

​

    public static void incr(ref int i)

    {

        i = i + 1;

    }

​

    public static void Main()

    {

        var d = new Data(1);

        addData(d, "test1");

        Console.WriteLine(d.addedData); //test1

        addData(d, "test2");

        Console.WriteLine(d.addedData); //test2

        int i = 1;

        incr(ref i);

        Console.WriteLine(i); //still 1,

    }

}

​

public class Data

{

    public int id

    {

        get;

        set;

    }

​

    public string addedData

    {

        get;

        set;

    }

​

    public Data(int id)

    {

        this.id = id;

    }

​

    public Data()

    {

    }

​

    public void enrich(string addedData)

    {

    }

}