private void button1_Click(object sender, EventArgs e)
{
OpenFileDialog open = new OpenFileDialog();
string strLine = null;
open.Filter = "文本文件(*.txt)|*.txt";
open.ShowDialog();
textBox1.Text = open.FileName;
StreamReader st=new StreamReader(textBox1.Text);
while((strLine=st.ReadLine())!=null)
{
textBox2.Text += strLine + Environment.NewLine;
}
}