C#

    private static void AddTabPageAtIndex(TabControl tc, TabPage tp, int index) {<br />
      // Get index into sensible range<br />
      if (index < 0)<br />
        index = 0;<br />
      else if (index > tc.TabCount)<br />
        index = tc.TabCount;<br />
<br />
      // Add a dummy page to the end<br />
      tc.TabPages.Add(new TabPage());<br />
<br />
      // Copy tab pages that are to be after new one<br />
      for (int i = tc.TabCount-1; i > index ; --i)<br />
        tc.TabPages[i] = tc.TabPages[i-1];<br />
      <br />
      // Insert the new page<br />
      tc.TabPages[index] = tp;<br />
    }