B/S c#项目 读取word文档内容怎么做

Microsoft.Office.Interop.Word.ApplicationClass wordApp = new ApplicationClass();
  object file = this.FileUpload1.PostedFile.FileName.ToString() as object;
  object nullobj = System.Reflection.Missing.Value;
  Microsoft.Office.Interop.Word.Document doc = wordApp.Documents.Open(
  ref file, ref nullobj, ref nullobj,
  ref nullobj, ref nullobj, ref nullobj,
  ref nullobj, ref nullobj, ref nullobj,
  ref nullobj, ref nullobj, ref nullobj,ref nullobj,ref nullobj,ref nullobj,ref nullobj);

  string yyy=doc.Content.ToString();



读取WORD文档内容然后赋给字符窜 请问怎么写？以上的代码是网上找的，读不出来数据。

------解决方案--------------------
读取WORD