get all files from folder in asp.net c#

 DirectoryInfo dr = new DirectoryInfo(Server.MapPath("images"));
        FileInfo[] f;
        f = dr.GetFiles();
        DataTable dt = new DataTable();
        dt.Columns.Add(new DataColumn("name", typeof(string)));
        dt.Columns.Add(new DataColumn("image", typeof(string)));
       
        foreach (FileInfo fi in f)
        {
            DataRow drow = dt.NewRow();
            drow["name"] = fi.Name;
            drow["image"] = fi.Name;
            dt.Rows.Add(drow);
        }
        GridView1.DataSource = dt;
        GridView1.DataBind();