c#如何打开并覆盖一个文件

private void 打开文件ToolStripMenuItem_Click(object sender, EventArgs e)
// {
// if (this.openFileDialog1.ShowDialog() == DialogResult.OK)
// {
// //listView1.Items.RemoveAt(listView1.SelectedIndex);
// //this.listBox1.Items.Remove(this.listBox1.SelectedItem);
// int Index = 0;
// if (this.listView1.SelectedItems.Count > 0)//判断listview有被选中项
// {
// Index = this.listView1.SelectedItems[0].Index;//取当前选中项的index,SelectedItems[0]这必须为0
// listView1.Items[Index].Selected = false;
// listView1.Select();
// }
// this.axWindowsMediaPlayer1.currentPlaylist.clear();

// listView1.BeginUpdate();
// Open o1 = new Open();
// stri