C＃创建一个包含已检查项目的帐单消息框

There's a form with three checkboxes and a button. Upon clicking on the button a messagebox is suppose to show up and display all the items that were checked on the form with price before tax and total. The price before tax and total are taken care of, but how would I display what was checked by the user on that form in the message box that will serve as a bill.There's a form with three checkboxes and a butt