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class Program
{
private string a;
private int b;
static void Main(string[] args)
{
Program p1 = new Program();
p1.a = "p1a";
p1.b = 1;
Program p2 = new Program();
p2.a = "p2a";
p2.b = 2;
new Program().ChangeA(p1, p2);
Console.WriteLine(p1.a + p1.b);
new Program().ChangeB(p1, p2);
Console.WriteLine(p1.a + p1.b);
}
private void ChangeA(Program p1, Program p2)
{
p1 = p2;
}
private void ChangeB(Program p1, Program p2)
{
p1.a = p2.a;
p1.b = p2.b;
}