<td class="forumrowhighlight">
  <div id="DIVcheck" runat="server">

  </div>
</td>

DataSet ds = ActionBLL.GetAllList();
foreach (DataRow dr in ds.Tables[0].Rows)
{
   CheckBox ck = new CheckBox();
   HtmlGenericControl div = new HtmlGenericControl("div");
   DIVcheck.Controls.Add(div);
   ck.Text = dr["action_name"].ToString();
   ck.ID = dr["action_id"].ToString();
   div.Style.Value = "float:left;width:150px";
   div.Controls.Add(ck);
}
ds.Dispose();

foreach (Control ct in this.Master.Controls)
{
   if (ct is CheckBox)
   {
      CheckBox ck = (CheckBox)ct;
   }
}