title: Programmatically update sharepoint 2013 "Created By", "Modified By" item fields
body: <p>Can I update these fields dynamically?</p>
  
  <pre><code>SPFile file = ds.Files.Add(ds.Url + @"\" + record.Name, data, true);
  file.Item["Created_x0020_By"] = "test";
  file.Item[SPBuiltInFieldId.Author] = "testauthor";
  file.Item[SPBuiltInFieldId.Editor] = "test editor";
  file.Item.Update();
  </code></pre>