GridView:验证selectedIndex>-1

我现在有一个 Gridview ,我想使用客户端验证来确保已选择行(即: SelectedIndex > -1 )

目前我正在使用 <asp:CustomValidator> 但希望远离服务器端验证。以下是我目前正在做的工作:

<asp:GridView ID="GridView1" runat="server" AutoGenerateColumns="False">
    <Columns>
        <asp:BoundField HeaderText="MSN" DataField="MSN" />
        <asp:CommandField ShowSelectButton="True" />
    </Columns>
</asp:GridView>
<asp:CustomValidator ID="cvSelected" runat="server" ErrorMessage="Please select!" />

然后在代码后面( .cs ):

Private Sub cvSelected_ServerValidate(ByVal source As Object, ByVal args As _
System.Web.UI.WebControls.ServerValidateEventArgs) Handles cvSelected.ServerValidate
    args.IsValid = (GridView1.SelectedIndex > -1)
End Sub