CheckBox全选(刷新)

<asp:TemplateField HeaderText="选取" SortExpression="Ispass">
                    <HeaderTemplate>
                        全选<asp:CheckBox ID="CheckBox2" runat="server" AutoPostBack="True" OnCheckedChanged="CheckBox2_CheckedChanged" />
                    </HeaderTemplate>
                        <EditItemTemplate>
                            <asp:CheckBox ID="CheckBox2" runat="server" Checked='<%# Bind("isPass") %>' />
                        </EditItemTemplate>
                        <ItemTemplate>
                        <asp:CheckBox ID="CheckBox2" runat="server" Checked='<%# Bind("isPass") %>' />
                    </ItemTemplate>
                    </asp:TemplateField>

后台：

protected void CheckBox2_CheckedChanged(object sender, EventArgs e)
    {
        int i;

        for (i = 0; i < GridView1.Rows.Count; i++)
        {
            ((CheckBox)GridView1.Rows[i].FindControl("CheckBox2")).Checked = ((CheckBox)sender).Checked;
        }
    }