C#控制WORD换行问题

Question

                  public void GoToTheTable(int ntable)
{
object missing = System.Reflection.Missing.Value;
object what;
what = Word.WdUnits.wdLine;
object which;
which = Word.WdGoToDirection.wdGoToAbsolute;
object count;
                            count = ntable;
oWordApplic.Selection.GoTo( ref what, ref which, ref count, ref missing);
                            oWordApplic.Selection.Find.ClearFormatting();
            
oWordApplic.Selection.Text = "";
                 }为什么焦点不变，仍是起始行，高手指教。