protected void Page_Load(object sender, EventArgs e)
{

shape s = new shape();
circle c = new circle();
shape ss;
ss = s;
Response.Write(ss.draw());
ss = c;
Response.Write(ss.draw());
}

class shape
{
public int i;
public virtual int draw()
{
i = 0;
return i;
}
}
class circle : shape
{
public int k;
public override int draw()
{
i++;
k = i;
return k;
}
}


}