如何datalist里获得checkbox的值？

[anlinsonsun]

CheckBox CbxTable=(CheckBox).Items[i].FindControl("ck_choice");这样能取到ck_choice的值吗？dl_mana_posi是datalist,ck_choice是checkbox.

[anlinsonsun]

private void bt_delete_Click(object sender, System.EventArgs e)
{
for (int i=1;i<dl_mana_posi.Items.Count;i++)
{
CheckBox CbxTable=(CheckBox)dl_mana_posi.Items[i].FindControl("ck_choice");

if(CbxTable.Checked)
{
if(lb_id.Text=="")
{
//获取单元格中的内容
lb_id.Text=(dl_mana_posi.DataKeys[i].ToString());
}
else
{
lb_id.Text=lb_id.Text+ "," +dl_mana_posi.DataKeys[i].ToString();
}
}
else
{
lb_id.Text="111";
}
}
wzcClass.wzcData.Open();
SqlCommand cmdshell=new SqlCommand("delete from IRC_publ_posi where count_id in('"+lb_id.Text+"')",wzcClass.wzcData.MyConn);
cmdshell.ExecuteNonQuery();
wzcClass.wzcData.Close();
//dl_mana_posi.DataBind();('"+lb_id.Text+"')
wzcClass.wzcScript.Show("删除成功！");
我想点删除按钮后，就把选种的删除。但无法得到CbxTable.Checked