程序代码：

            string text = this.txtWrite.Text;
            try
            {
                using (TextWriter tw = File.CreateText("test.txt"))
                {
                    tw.WriteLine(text);
                }
                MessageBox.Show("写入成功!");
                this.txtWrite.Text = "";
            }
            catch(Exception ex)
            {
                MessageBox.Show(ex.Message);
            }