openFileDialog1.Filter = "文本文件(*.txt)|*.txt";//设置过滤参数

            openFileDialog1.ShowDialog();//显示打开文件的对话框

            textBox1.Text = openFileDialog1.FileName;

            StreamReader sr = new StreamReader(textBox1.Text, Encoding.Default);

            textBox2.Text = sr.ReadLine();

            sr.Close();