asp.net Repeater取得CheckBox選中的某行某個值

1、
foreach (Control c in this.rptTables.Controls)
{
CheckBox cbx = (CheckBox)c.FindControl("cbxId");
TextBox tbx = (TextBox)c.FindControl("tbxTableName");
if (cbx != null)
{
if (cbx.Checked == true)
{
common.salert(tbx.Text);
}

}
}

2、
for (int i = 0; i < this.rptTables.Items.Count; i++)
{
CheckBox cbx = (CheckBox)rptTables.Items[i].FindControl("cbxId");
TextBox tbx = (TextBox)rptTables.Items[i].FindControl("tbxTableName");
if (cbx != null)
{
if (cbx != null)
{
if (cbx.Checked)
{
common.salert(tbx.Text);
}
}
}
}
關鍵點：在每行再寫個隱藏的控制項我是用TextBox，代碼如下：
<asp:TextBox id="tbxTableName" runat="server" Text='<%#Eval("TABLE_NAME") %>' style="display:none;" />