Get checked checkbox list values inside a repeater - asp.net

Question

How can I get checked values form checkboxlists inside a repeater, I have no idea how collect all checked values in a collection list.
<asp:Repeater runat="server" ID="rp_outer" OnItemDataBound="rp_outer_ItemDataBound">
<ItemTemplate>
<a class="collapsed btn" data-toggle="collapse" data-target="#Col<%#Eval("ProID") %>"> <%#Eval("PropEName") %></a>
<div id="Col<%#Eval("ProID") %>" class="collapse in">
<asp:CheckBoxList ID="cbxlist" runat="server" CssClass="filter-ul" DataSource='<%# DataBinder.Eval(Container.DataItem, "rltbls") %>' DataValueField='ID' DataTextField='ValuesEName'>
</asp:CheckBoxList>
</div>
<hr />
</ItemTemplate>
</asp:Repeater>

Answer 1

you need grouping items with ProId.
<ItemTemplate>
<a class="collapsed btn" data-toggle="collapse" data-target="#Col<%#Eval("ProID") %>"> <%#Eval("PropEName") %></a>
<asp:HiddenField runat="server" ID="ProID" Value="<%#Eval("ProID") %>"/>
<div id="Col<%#Eval("ProID") %>" class="collapse in">
....
You can create a dictionary list that uses ProId as a key
private Dictionary<string, List<string>> GetCheckedItems()
{
Dictionary<string, List<string>> checkedItemsList = new Dictionary<string, List<string>>();
foreach (RepeaterItem item in rp_outer.Items)
if (item.ItemType == ListItemType.Item)
{
CheckBoxList itemCheckBoxList = item.FindControl("cbxlist") as CheckBoxList;
if (itemCheckBoxList != null)
{
string proIdValue = (item.FindControl("ProID") as HiddenField).Value;
List<string> checkedItems = new List<string>();
foreach (ListItem checkBoxItem in itemCheckBoxList.Items)
if (checkBoxItem.Selected)
checkedItems.Add(checkBoxItem.Value);
checkedItemsList.Add(proIdValue, checkedItems);
}
}
return checkedItemsList;
}