/// <summary>        /// 读取文本文件        /// </summary>        /// <param name="txtfileName">文件路径</param>        private void FromTxtTodata(string txtfileName)        {            string txt = "";            using (StreamReader reader = new StreamReader(txtfileName,Encoding.Default ))            {                //循环读取所有行                //while (!reader.EndOfStream)                //{                   // txt += reader.ReadLine() + System.Environment.NewLine;                //}                txt += reader.ReadToEnd();            }            MessageBox.Show("导入完成！");        }