Using the ref keyword with reference types

ReferenceRefTest.cs

class ReferenceRefTest
{
  class C
	{
		public int i;
		
		public C(int i) {this.i = i;}
	}
	
	static int Main()
	{
		var c1 = new C(1);
		var c1_original = c1;
		var c2 = new C(2);
		Change(ref c1);
		Console.WriteLine("c1.i == {0}", c1.i);
		Console.WriteLine("c1_original.i == {0}", c1_original.i);
		Console.WriteLine("c2.i == {0}", c2.i);
		
		return 0;
	}
	
	static void Change(ref C c)
	{
		c = new C(3);
	}
}