Request["YS_ID"]获得不到GridView 中行主键值?
<asp:GridView ID="GridView1" runat="server" AllowSorting="True" AutoGenerateColumns="False" DataKeyNames="YS_ID" PageSize="5" Font-Size="9pt" BackColor="White" BorderColor="#CCCCCC" BorderStyle="None" BorderWidth="1px" Width="100%" AllowPaging="true" PageIndex="0" HorizontalAlign="Right">
<FooterStyle BackColor="White" ForeColor="#000066" />
<Columns>
<asp:TemplateField>
<ItemTemplate>
<asp:CheckBox ID="CheckBox1" runat="server" />
</ItemTemplate>
</asp:TemplateField>
<asp:BoundField DataField="YS_ID" HeaderText="序号" ReadOnly="true" />
<asp:BoundField DataField="YS_Type" HeaderText="类型" />
</Columns>
<asp:TemplateField>
<ItemTemplate>
<img src="images/11.gif" width="14" height="14" /><asp:LinkButton ID="lkbdelete" runat="server" CommandName="shanchu" style="font-size:12px;" CommandArgument='<%#Eval("YS_ID")%>' OnClientClick="return confirm('确定删除吗?');">删除</asp:LinkButton> <img src="images/22.gif" width="14" height="14" />><a href="YServices_Alter.aspx?YS_ID=<%#Eval("YS_ID")%>" style="font-size:12px;">编辑</a>
</ItemTemplate>
</asp:TemplateField>
<RowStyle ForeColor="#000066" />
<SelectedRowStyle BackColor="#669999" Font-Bold="True" ForeColor="White" />
<PagerStyle BackColor="White" ForeColor="#000066" HorizontalAlign="Left" />
<HeaderStyle BackColor="#ddeef2" Font-Bold="True" ForeColor="#000000" />
</asp:GridView>
Request["YS_ID"] 获得到的是GridView1中所有绑定数据的YS_ID,为什么得不到某一行的YS_ID,怎么才能获得到YS_ID?