Radio buttons and check boxes to display selected in textbox

Question

hello guys , i have created a form with 3 radio buttons in a groupbox.
and 4 check boxes also in a groupbox . in my form i have a button and a text box which is  set not to be visible  before the button is clicked. now i want to make  the selected item from the radio button group and whichever check box is selected from the checkbox group to be displayed in the textbox as soon as the button is clicked. any help please?