title: SPListItem Save conflict while Update
body: <pre><code>(1) var list1 = web.GetList("/lists/list1");
  (2) var item1 = list1.GetItemById(10001);
  (3) ...
  </code></pre>
  
  <p>take breakpoint here, open item with ID = 10001 for edit, change 'Title' fields and save it. Then run code follow:</p>
  
  <pre><code>(4)item1[SPBuiltInFieldId.Title] = "some text";
  (5)item1.Update();
  </code></pre>
  
  <p>row (5) throws save conflict exception.</p>
  
  <p>How can to lock item for edit at line (3)? Or any other approach to avoid conflict?</p>