How to show form2 textbox data in form1 textbox

Question

I have 2 forms form1 and form2. First when you run the application form1 will open. In form1 there is one text box and one button. Do not enter any text in that textbox. Please just click on the button. After clicking the button form2 should be displayed. But, do not close form1. In form2 also there is one text box and one button. Now enter some text in the form2 textbox and click the button. The text should be displayed in the form1 textbox.