C# 遍歷文件夾下所有子文件夾中的文件，得到文件名

假設a文件夾在F盤下，代碼如下。將文件名輸出到一個ListBox中
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.IO;

namespace WindowsFormsApplication1
{
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
}
private void button2_Click(object sender, EventArgs e)
{
DirectoryInfo theFolder = new DirectoryInfo(@"F:\a\");
DirectoryInfo[] dirInfo = theFolder.GetDirectories();
//遍歷文件夾
foreach (DirectoryInfo NextFolder in dirInfo)
{
// this.listBox1.Items.Add(NextFolder.Name);
FileInfo[] fileInfo = NextFolder.GetFiles();
foreach (FileInfo NextFile in fileInfo) //遍歷文件
this.listBox2.Items.Add(NextFile.Name);
}

}
}
}