Dynamic Polymorphism

AttackHandler.cs

private void btnAttack_Click(object sender, EventArgs e)
{
	weapon.Attack();
}

Bomb.cs

public class Bomb : IWeapon    
{       
    public void Attack() 
    {
        System.Windows.Forms.MessageBox.Show("Bomb!!");        
    }    
}

ChangeWeaponHandler.cs

private void rboSword_CheckedChanged(object sender, EventArgs e)
{
	weapon = new Sword();
}
private void rboGun_CheckedChanged(object sender, EventArgs e)
{
	weapon = new Gun();
}
private void rboBomb_CheckedChanged(object sender, EventArgs e)
{
	weapon = new Bomb();
}

Gun.cs

public class Gun : IWeapon    
{       
    public void Attack() 
    {            
        System.Windows.Forms.MessageBox.Show("Gun!!");        
    }    
}

IWeapon.cs

public interface IWeapon 
{ 
    void Attack(); 
}

MainForm.cs

public partial class MainForm : Form
{
	private IWeapon weapon = new Sword();	
}

Sword.cs

public class Sword : IWeapon    
{       
    public void Attack() 
    {            
        System.Windows.Forms.MessageBox.Show("Sword!!");        
    }    
}