如何制作 Gridview 标题复选框

<asp:GridView ID="GridView1" runat="server" AutoGenerateColumns="False" DataKeyNames="ID">
   <Columns>
        <asp:TemplateField HeaderText="全选" ItemStyle-HorizontalAlign="Center" HeaderStyle-Width="50px">
           <HeaderTemplate>
                <asp:CheckBox ID="chkAll" runat="server" onclick="checkAll(this);" />
            </HeaderTemplate>
            <ItemTemplate>
                <asp:CheckBox ID="chkItem" runat="server" />
            </ItemTemplate>
            <ItemStyle HorizontalAlign="Center"></ItemStyle>
        </asp:TemplateField>
        <!-- 其他列定义 -->
    </Columns>
</asp:GridView>

    function checkAll(chk) {
        var grid = document.getElementById('<%= GridView1.ClientID %>');
        for (var i = 0; i< grid.rows.length; i++) {
            var row = grid.rows[i];
            if (row.rowIndex != 0) {
                var chkItem = row.cells[0].getElementsByTagName('input')[0];
                chkItem.checked = chk.checked;
            }
        }
    }
</script>

protected void Page_Load(object sender, EventArgs e)
{
    if (!IsPostBack)
    {
        BindGridView();
    }
}

private void BindGridView()
{
    // 获取数据源
    DataTable dt = GetData();

    // 将数据源绑定到 GridView 控件中
    GridView1.DataSource = dt;
    GridView1.DataBind();
}

private DataTable GetData()
{
    // 这里可以从数据库中获取数据
    DataTable dt = new DataTable();
    dt.Columns.Add("ID", typeof(int));
    dt.Columns.Add("Name", typeof(string));
    dt.Rows.Add(1, "张三");
    dt.Rows.Add(2, "李四");
    dt.Rows.Add(3, "王五");
    return dt;
}