最正确的为GridView添加删除提示的方法转

方法一（已测试）：

首先将按钮那一列转化为模版，然后在其属性里加入下面的js语句，就能弹出一个确认窗口。
<ItemTemplate>
         <asp:LinkButton ID="LinkButton1" runat="server" CausesValidation="False" CommandName="Select"
                            Text="选择" >
       </asp:LinkButton>
        <asp:LinkButton ID="LinkButton2" runat="server" CausesValidation="False" CommandName="Delete" Text="删除"
OnClientClick="return confirm( Are you sure you want to delete this record? )" >
       </asp:LinkButton>
</ItemTemplate>

方法二（已测试）：

按钮类型选择：linkbutton

((LinkButton)e.Row.Cells[1].Controls[0]).Attributes.Add("onclick", " return confirm('你确定要删除吗');")

方法三（未测试）：

在Page_Load里面先注册一段服务器端脚本：   

if (!Page.ClientScript.IsClientScriptBlockRegistered("deleteConfirmBlock"))
{
            Page.ClientScript.RegisterClientScriptBlock(typeof(string), "deleteConfirmBlock", "function deleteConfirm(){confirm( 确认要删除? );}", true);

}

然后在“删除”按钮的响应函数里面调用这段脚本：

if(Page.ClientScript.IsstartupScriptRegistered("deleteConfirmBlock")){
                Page.ClientScript.RegisterStartupScript(typeof(string), "deleteConfirmBlock","confirmDelete()");
}
//后面的就是删除动作

http://hi.baidu.com/horsehome86/blog/item/b7faa0238bf2d7559822ed08.html