public List<Guid> CollectCheckboxRepeater(Repeater repeater)
{
List<Guid> lst = new List<Guid>();
foreach (RepeaterItem r in repeater.Items) {
CheckBox chk = (CheckBox)r.FindControl("chk");
Guid id = new Guid(chk.Attributes["value"].ToString());
if (chk.Checked) {
lst.Add(id);
}
}
return lst;
}