前台代码
FONT><asp:datagrid style="Z-INDEX: 0" id="gv_HandReport" runat="server" Width="959px" AutoGenerateColumns="False" Height="258px" Font-Size="12px" OnItemDataBound="gvUsers_RowDataBound">
                                <SelectedItemStyle Font-Bold="True" ForeColor="White" BackColor="#669999"></SelectedItemStyle>
                                <ItemStyle ForeColor="#000066"></ItemStyle>
                                <HeaderStyle Font-Bold="True" ForeColor="White" BackColor="#006699"></HeaderStyle>
                                <FooterStyle ForeColor="#000066" BackColor="White"></FooterStyle>
                                <Columns>
                                    <asp:BoundColumn DataField="ID" HeaderText="id"></asp:BoundColumn>
                                    <asp:BoundColumn DataField="VendorAccount" HeaderText="代号"></asp:BoundColumn>
                                    <asp:BoundColumn DataField="VendorName" HeaderText="供应商"></asp:BoundColumn>
                                    <asp:BoundColumn DataField="CustomsID" HeaderText="物料代号"></asp:BoundColumn>
                                    <asp:BoundColumn DataField="CustomsName" HeaderText="物料名称"></asp:BoundColumn>
                                    <asp:BoundColumn DataField="Unit" HeaderText="单位"></asp:BoundColumn>
                                    <asp:BoundColumn DataField="Amount" HeaderText="数量"></asp:BoundColumn>
                                    <asp:BoundColumn DataField="InvoiceAmount" HeaderText="金额"></asp:BoundColumn>
                                    <asp:BoundColumn DataField="InvoiceCode" HeaderText="发票号码"></asp:BoundColumn>
                                    <asp:BoundColumn DataField="InvoiceDate" HeaderText="开票日期" DataFormatString="{0:yyyy-MM-dd}"></asp:BoundColumn>
                                    <asp:ButtonColumn Text="del" CommandName="edit" HeaderText="删除"></asp:ButtonColumn>
                                </Columns>
                            </asp:datagrid>
下面这是我网上找的代码，没报错，但是没反应，求大神帮忙！！！！
 Protected Sub gvUsers_RowDataBound(ByVal sender As System.Object, ByVal e as DataGridItemEventArgs)
        If e.Item.ItemType = ListItemType.Item.EditItem Then
            e.Item.Cells(3).Attributes.Add("style", "mso-number-format:\@;")
        End If
    End Sub