如何使用asp.net C#在循环中进行网格视图列选择

<asp:GridView ID="GridView1" runat="server" AutoGenerateColumns="False">
    <Columns>
        <asp:TemplateField>
            <HeaderTemplate>
                <asp:CheckBox ID="chkSelectAll" runat="server" onclick="SelectAllCheckboxes(this);" />
            </HeaderTemplate>
            <ItemTemplate>
                <asp:CheckBox ID="chkSelect" runat="server" />
            </ItemTemplate>
        </asp:TemplateField>
        <asp:BoundField DataField="ColumnName1" HeaderText="Column 1" />
        <asp:BoundField DataField="ColumnName2" HeaderText="Column 2" />
        <!-- 添加其他列 -->
    </Columns>
</asp:GridView>

protected void btnSubmit_Click(object sender, EventArgs e)
{
    foreach (GridViewRow row in GridView1.Rows)
    {
        CheckBox chkSelect = (CheckBox)row.FindControl("chkSelect");
        if (chkSelect.Checked)
        {
            // 处理选中的行
            string column1Value = row.Cells[1].Text; // 获取第一列的值
            string column2Value = row.Cells[2].Text; // 获取第二列的值
            // ...
        }
    }
}