gistfile1.txt

class TheClass
{
	public int Val1;
	public TheClass Old;

	public void Remember()
	{
		Old = (TheClass)MemberwiseClone();
	}
}

internal class Program
{
	private static void Main(string[] args)
	{
		TheClass aClass = new TheClass();
		aClass.Val1 = 5;
		aClass.Remember();
		aClass.Val1 = 10;
		Console.WriteLine(aClass.Old.Val1);
		Console.ReadKey();
	}
}