title: How to update textbox in form1 from form2?
body: <p>I have 2 Windows Forms. </p>
  
  <p>In first, the main window form, has multiline textbox and a button. The button opens the second form in which I can add data to array by using AddEntry object. </p>
  
  <p>In second form I have textboxes and a button (btnAddEntry) which should update the content of the textbox from first form. </p>
  
  <p>When data is entered I want to display data in textbox from the first form. </p>
  
  <p>The problem is that code I came up with doesn't seem to work. </p>
  
  <p>How would I solve this?</p>