c#读Word文件,最后彻底释放资源

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private void button5_Click(object sender, System.EventArgs e)
    {
      object filename="D:\\nettest\\window\\serial\\a.doc"; //要打开的文档路径
      string strKey="正文"; //要搜索的文本
      object MissingValue=Type.Missing;
      object oMissing = System.Reflection.Missing.Value;

      Word.Application wp=new Word.ApplicationClass();
Word.Document wd=wp.Documents.Open(ref filename,ref MissingValue,
        ref MissingValue,ref MissingValue,
        ref MissingValue,ref MissingValue,
        ref MissingValue,ref MissingValue,
        ref MissingValue,ref MissingValue,
        ref MissingValue,ref MissingValue,
        ref MissingValue,ref MissingValue,
        ref MissingValue,ref MissingValue);

      if (wd.Content.Text.IndexOf(strKey)>=0)
      {
        MessageBox.Show("文档中包含指定的关键字！","搜索结果",MessageBoxButtons.OK);
      }
      else
      {
        MessageBox.Show("文档中没有指定的关键字！","搜索结果",MessageBoxButtons.OK);
      }
      wd.Close(ref oMissing, ref oMissing, ref oMissing);
      System.Runtime.InteropServices.Marshal.ReleaseComObject (wd);
      wd = null;

      wp.Quit(ref oMissing, ref oMissing, ref oMissing);
      System.Runtime.InteropServices.Marshal.ReleaseComObject (wp);
      wp = null;
      System.GC.Collect();
    }

    private void button6_Click(object sender, System.EventArgs e)
    {
      object filename="D:\\nettest\\window\\serial\\a.doc"; //要打开的文档路径
      string strKey="正文"; //要搜索的文本
      object MissingValue=Type.Missing;
      object oMissing = System.Reflection.Missing.Value;

      Word.Application wp=new Word.ApplicationClass();
      Word.Document wd=wp.Documents.Open(ref filename,ref MissingValue,
        ref MissingValue,ref MissingValue,
        ref MissingValue,ref MissingValue,
        ref MissingValue,ref MissingValue,
        ref MissingValue,ref MissingValue,
        ref MissingValue,ref MissingValue,
        ref MissingValue,ref MissingValue,
        ref MissingValue,ref MissingValue);

      wd.Content.Find.Text=strKey;
      if (wd.Content.Find.Execute(ref MissingValue,ref MissingValue,
        ref MissingValue,ref MissingValue,
        ref MissingValue,ref MissingValue,
        ref MissingValue,ref MissingValue,
        ref MissingValue,ref MissingValue,
        ref MissingValue,ref MissingValue,
        ref MissingValue,ref MissingValue,
        ref MissingValue))
      {
        MessageBox.Show("文档中包含指定的关键字！","搜索结果",MessageBoxButtons.OK);
      }
      else
      {
        MessageBox.Show("文档中没有指定的关键字！","搜索结果",MessageBoxButtons.OK);
      }
      wd.Close(ref oMissing, ref oMissing, ref oMissing);
      System.Runtime.InteropServices.Marshal.ReleaseComObject (wd);
      wd = null;

      wp.Quit(ref oMissing, ref oMissing, ref oMissing);
      System.Runtime.InteropServices.Marshal.ReleaseComObject (wp);
      wp = null;
      System.GC.Collect();
    }

    private void button7_Click(object sender, System.EventArgs e)
    {
      object filename="D:\\nettest\\window\\serial\\a.doc"; //要打开的文档路径
      string strKey="正文"; //要搜索的文本
      object MissingValue=Type.Missing;
      object oMissing = System.Reflection.Missing.Value;

      Word.Application wp=new Word.ApplicationClass();
      Word.Document wd=wp.Documents.Open(ref filename,ref MissingValue,
        ref MissingValue,ref MissingValue,
        ref MissingValue,ref MissingValue,
        ref MissingValue,ref MissingValue,
        ref MissingValue,ref MissingValue,
        ref MissingValue,ref MissingValue,
        ref MissingValue,ref MissingValue,
        ref MissingValue,ref MissingValue);

      wd.Content.Find.Text=strKey;
      int i=0,iCount=0;
      Word.Find wfnd;

      if (wd.Paragraphs!=null && wd.Paragraphs.Count>0)
      {
        iCount=wd.Paragraphs.Count;
        for(i=1;i<=iCount;i++)
        {
          wfnd=wd.Paragraphs[i].Range.Find;
          wfnd.ClearFormatting();
          wfnd.Text=strKey;
          if (wfnd.Execute(ref MissingValue,ref MissingValue,
            ref MissingValue,ref MissingValue,
            ref MissingValue,ref MissingValue,
            ref MissingValue,ref MissingValue,
            ref MissingValue,ref MissingValue,
            ref MissingValue,ref MissingValue,
            ref MissingValue,ref MissingValue,
            ref MissingValue))
          {
MessageBox.Show("文档中包含指定的关键字！","搜索结果",MessageBoxButtons.OK);
            break;
          }
        }
      }
      wd.Close(ref oMissing, ref oMissing, ref oMissing);
      System.Runtime.InteropServices.Marshal.ReleaseComObject (wd);
      wd = null;

      wp.Quit(ref oMissing, ref oMissing, ref oMissing);
      System.Runtime.InteropServices.Marshal.ReleaseComObject (wp);
      wp = null;
      System.GC.Collect();
    }