列出文件夹下文件列表,显示，删除

using System.IO;
using System.Collections;

public partial class _Default : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
        if (!IsPostBack)
        {
            ArrayList arylst = new ArrayList();
            string filepath = Server.MapPath("list");
            DirectoryInfo info = new DirectoryInfo(filepath);
            FileInfo[] fileinfo = info.GetFiles();
            foreach (FileInfo allfile in fileinfo)
            {
                arylst.Add(allfile);
            }
            this.ListBox1.DataSource = arylst;
            this.ListBox1.DataBind();

        }
    }
}

 protected void btnView_Click(object sender, EventArgs e)
    {
        Response.Redirect("list/" + this.ListBox1.SelectedValue);
    }
    protected void btnDelete_Click(object sender, EventArgs e)
    {
        string filepath = Server.MapPath("list/");
        File.Delete(filepath + this.ListBox1.SelectedValue);
        Response.Write("<script>alert('页面删除成功！');location='Default.aspx'</script>");
    }