文本文档导入数据库

 执行下来老提示“导入的文档失败，请检查你选择文档的有效性..”，请问，是不是try{}语句中哪写错了protected void btninputdata_click(object sender, EventArgs e)
        {
            if (fufile.PostedFile == null || fufile.PostedFile.ContentLength <= 0)
            {
                AddLoadMessage("导入的文档不正确，请重新选择你要导入的文档...");
                return;
            }
            string filename = fufile.PostedFile.FileName.Trim();
            if (filename.EndsWith(".txt") == false)
            {
                AddLoadMessage("导入的文档不是文本文档，请重新选择你要导入的文档...");
                return;
            }
            try
            {
                string fullname = Server.MapPath("~/Files/"+filename);
                fufile.PostedFile.SaveAs(fullname);
                string textline;
                StreamReader freader = File.OpenText(filename);
               
                while ((textline = freader.ReadLine()) != null)
                {
                    if (textline.Length == 0)
                        continue;
                        string[] text = new string[8];
                        text = textline.Split('|');
                        DB.info_word_save2(text[0].Trim(), text[1].Trim(), text[2].Trim(), text[3].Trim(), text[4].Trim(), text[5].Trim(), text[6].Trim(), text[7].Trim(), 0);
                        if (Request.QueryString["s"] != null)
                        {
                            DB.info_gradeword_save(Request.QueryString["s"], text[0].Trim());
                        } 
                }
                FileInfo file = new FileInfo(Server.MapPath("~/Files/") + filename);
                if (file.Exists)
                {//删除文件 
                    file.Delete();
                }             }
            catch
            {
            AddLoadMessage("导入的文档失败，请检查你选择文档的有效性...");
            }
}