title: Read all item from listbox in windows application
body: <p>I have two listbox in windows Form c#, the first one has all valid rooms at this time &amp; the 2nd has the current rooms reserved to the Guest, &amp; the user can change this data by transfer between this listboxex.</p>
  
  <p>as example:</p>
  
  <p>list1: 1d ,5d ,6d , 1r, 12r</p>
  
  <p>list2: 2d, 4d</p>
  
  <p>the user can delete 2d and put instead of it 6d.</p>
  
  <p>what I need how can I read all data from list2 after user update it, &amp; use this to update my table in sql server.</p>