How to move listbox items to a listbox in another form?

Question

Hi I am having a problem adding items from a listbox (with the click of a button) and then sending them to another listbox which is on another form.

 

My code:

 

private void PlaceOrder_Click(object sender, EventArgs e)

{

new AreYouSure().Show();

this.Show();

MenuBox.Items.Clear();

TotalBox.Items.Clear();

total.Clear();

ordertotal = 0;

}

 

My button is called 'Place Order' and my other form is called 'Confirmation'

 

Any help whatsoever is very much appreciated...