este código está en vb pero por si te puede servir...
Código:
<%@ Import Namespace="System.IO" %>
<script language="VB" runat="server">
Sub Page_Load(sender as Object, e as EventArgs)
Dim dirInfo as New DirectoryInfo(Server.MapPath(""))
articleList.DataSource = dirInfo.GetFiles("*.aspx")
articleList.DataBind()
End Sub
</script>
<asp:DataGrid runat="server" id="articleList" Font-Name="Verdana"
AutoGenerateColumns="False" AlternatingItemStyle-BackColor="#eeeeee"
HeaderStyle-BackColor="Navy" HeaderStyle-ForeColor="White"
HeaderStyle-Font-Size="15pt" HeaderStyle-Font-Bold="True">
<Columns>
<asp:HyperLinkColumn DataNavigateUrlField="Name" DataTextField="Name"
HeaderText="File Name" />
<asp:BoundColumn DataField="LastWriteTime" HeaderText="Last Write Time"
ItemStyle-HorizontalAlign="Center" DataFormatString="{0:d}" />
<asp:BoundColumn DataField="Length" HeaderText="File Size"
ItemStyle-HorizontalAlign="Right"
DataFormatString="{0:#,### bytes}" />
</Columns>
</asp:DataGrid>