C# - passing reference with value

[Arash_89]

Hello,


Why can we modified elements of object (This behavior seems to fly in the face of what it means to pass a parameter by value) but we cannot reassign new instance for it?

Given that I were able to change the incoming Person, What was copied?


using System;
using System.Collections.Generic;
using System.Text;

namespace ConsoleApp1
{
class Person
{
public Person() { }
public string Name;
public int Age;

public Person(string name,int age)
{
Name = name;
Age = age;
}

public void Display()
{
Console.WriteLine($"Name: {Name} - Age: {Age}");
}
}
class Program
{
static void Main(string[] args)
{
Person p = new Person("Daniel",20);
Console.WriteLine("Before Send");
p.Display();
Change(p);
Console.WriteLine("After Send");
p.Display();
}
static void Change(Person p)
{
p.Age = 100; //modified
p = new Person("Nikki",50); // NOT possible to reassign
}
}

}

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