net处理Excel

aspx:
<form id="form1" runat="server">
    <div>
        <input id="File1" type="file" name="File1" runat=server /><br />
        <br />
        <asp:Button ID="Button1" runat="server" OnClick="Button1_Click" Text="Button" /><br />
        <br />
        <asp:GridView ID="GridView1" runat="server">
        </asp:GridView>
        &nbsp;</div>
    </form> 

using System.Data.OleDb;
protected void Button1_Click(object sender, EventArgs e)
    {
        string source = File1.Value;
        string ConnStr = "Provider=Microsoft.Jet.OLEDB.4.0;Data Source=" +source+";Extended Properties=Excel 8.0";
        string query = "select * from [Sheet1$]";

        OleDbCommand cmd = new OleDbCommand(query, new OleDbConnection(ConnStr));
        OleDbDataAdapter adp= new OleDbDataAdapter(cmd);
        DataSet ds= new DataSet();
        adp.Fill(ds,"[Sheet1$]");

        GridView1.DataSource = ds;
        GridView1.DataMember = "[Sheet1$]";
        GridView1.DataBind();
    }