title: Get selected tree node item full path in C# (WinForms)
body: <p>I have a <code>TreeView</code> component and content of it like this:</p>
  
  <pre>
  MainLine  
    + SubLine1 
    + SUbline2
    + Subline3
    + Subline4
    + Subline5
    - Subline6
        SublineDetail1
        **SublineDetail2**
        SublineDetail3
  </pre>
  
  <p>Assume that <code>SublineDetail2</code> is selected and I want to get full path of it as string to a textbox just like this "(1.6.2)".</p>
  
  <p>How can I do that?</p>