连接字符串：

<connectionstring>

<add name="db" connectionString="Provider=Microsoft.Jet.OLEDB.4.0;Data Source=d:\\book1.xls;Extended Properties='Excel 8.0;HDR=Yes;IMEX=1'"
     providerName="System.Data.OleDb" />

</connectionstring>

源代码

<asp:SqlDataSource ID="db" ConnectionString="<%$ ConnectionStrings:ConnectionString2 %>"
            ProviderName="<%$ ConnectionStrings:ConnectionString2.ProviderName %>"  SelectCommand="SELECT * FROM [sheet1$]" runat="server"></asp:SqlDataSource>
        <asp:GridView ID="GridView1" runat="server" DataSourceID="db" Width="469px">
        </asp:GridView>