怎么遍历并获取GridView中checkBox是否选中以及该项的id？？？
在gridview表中我添加了复选框 

<asp:TemplateField HeaderText="全选">

                    <HeaderTemplate>

                        <asp:CheckBox ID="CheckBox1" runat="server" AutoPostBack="True" 

                            oncheckedchanged="CheckBox1_CheckedChanged" Text=" " />

                    </HeaderTemplate>

                    <ItemTemplate>

                        <asp:CheckBox ID="ck" runat="server" oncheckedchanged="ck_CheckedChanged" />

                    </ItemTemplate>

                </asp:TemplateField>

.CS文件

protected void CheckBox1_CheckedChanged(object sender, EventArgs e)

    {

        CheckBox all = (CheckBox)sender;

        foreach (GridViewRow g in GridView1.Rows)

        {

            CheckBox ck = (CheckBox)g.FindControl("ck");

            ck.Checked = all.Checked;

        }

    }

    protected void ck_CheckedChanged(object sender, EventArgs e)

    {



    }

现在我想获得选中项的id值，并根据此ID值，在弹出层中显示详细信息？？请问如何实现着个过程