C#

int i = 1;
object o = i;
Console.WriteLine(o.ToString());
i=10;
Console.WriteLine(o.ToString());
Console.ReadLine();

	class Test1
	{
		public int _i =-1;
		public Test1(int i)
		{_i=i;}
		public override string ToString()
		{return _i.ToString();}
	}
Test1 t1 = new Test1(100);
Test1 t2 = t1;
Console.WriteLine(t1.ToString());
t2._i=200;
Console.WriteLine(t2.ToString());
Console.WriteLine(t1.ToString());
Console.ReadLine();

public static object Clone(object objectToClone) 
{
	if (objectToClone == null) 
	{
		throw new ArgumentNullException("objectToClone", "Parameter can not be null.");
	}
	BinaryFormatter formatter = new BinaryFormatter();
	MemoryStream stream = new MemoryStream();
	formatter.Serialize(stream, objectToClone);
	stream.Seek(0, SeekOrigin.Begin);
	return formatter.Deserialize(stream);
}

MyTest originalObject = new MyTest(a, lot, of, stuff);
MyTest cloneObject = (MyTest)Clone(originalObject);

using System;
 
namespace test
{
    public class Test
    {
        public static void Main(string [] args)
        {
            int a = 1;
            object o = a;
            object o2 = o;
 
            Console.WriteLine("a = {0}, o = {1}, o2 = {2}", a, o, o2);
 
            // Change the value of 'a'
            a = 2;
 
	    Console.WriteLine("a = {0}, o = {1}, o2 = {2}", a, o, o2);
 
            // Change what 'o' references
            o = 3;
 
            Console.WriteLine("a = {0}, o = {1}, o2 = {2}", a, o, o2);
        }
    }
}

a = 1, o = 1, o2 = 1<br />
a = 2, o = 1, o2 = 1<br />
a = 2, o = 3, o2 = 1

object *o, *o2;
int i;

i = 1;

o = __box(i);  // box i and point o at it

o2 = o; // o2 now points to what o points at

i = 3; // Doesn't effect what o or o2 points at 
// because they point at a boxed copy of i, not to i itself

o = __box(i); // o now points at a new copy of i

// o2 still points at the original boxed copy of i.