c#语言实现对电脑文件夹的批量改名，选定改名

//当点击文件改名选择文件夹的时候
string s;
private void 选择文件夹ToolStripMenuItem_Click(object sender, EventArgs e)
{
textBox1.Clear();
textBox2.Clear();
comboBox1.Text = null;
listView1.Clear();
DialogResult isok = folderBrowserDialog1.ShowDialog();   //打开文件夹
if (isok == DialogResult.OK)
{
s = folderBrowserDialog1.SelectedPath;    //选择文件夹名
comboBox1.Text = s;                      //把文件名显示一下
comboBox1.Items.Add(s);
}

}
//当点击文件列举的时候
List<string> al = new List<string>();
private void 文件列举ToolStripMenuItem1_Click(object sender, EventArgs e)
{

foreach (string file in Directory.GetFiles(comboBox1.Text))  //用Directory.getfiles方法读取文件夹里文件名，遍历出来然后放在file这个变量里
{
al.Add(file);
}
listView1.Columns.Clear();
listView1.Columns.Add("文件名",400);
listView1.Items.Clear();
listView1.GridLines = true;
for (int i = 0; i < al.Count; i++)
{
listView1.Items.Add(al[i].ToString());
}

}

//修改一个文件夹里全部的文件名
private void 批量改名ToolStripMenuItem_Click(object sender, EventArgs e)
{
for (int i = 0; i < al.Count; i++)
{
System.IO.File.Move(al[i].ToString(), al[i].Replace(System.IO.Path.GetFileName(al[i]), textBox1.Text.ToString() + (i + 1).ToString() + System.IO.Path.GetExtension(al[i]).ToString()));

}
}
//修改选中的文件名
private void 部分改名ToolStripMenuItem_Click(object sender, EventArgs e)
{

MessageBox.Show(listView1 .SelectedItems .Count.ToString());
for (int i = 0; i <listView1 .SelectedItems .Count; i++)
{

System.IO.File.Move(listView1.SelectedItems[i].Text,al[i].Replace(System.IO.Path.GetFileName(al[i]),textBox1.Text .ToString()+(i+1).ToString ()+System.IO .Path .GetExtension(al[i].ToString ())));
}