How to get the id of the checkbox that has just been checked by the user using jQuery?

<div data-role="fieldcontain" style="margin: 0px">
    <fieldset data-role="controlgroup">
       
<asp:Repeater ID="rpt" runat="server">
           
<ItemTemplate>
               
<input type="checkbox" name="chkBox"                  
id="<%# DataBinder.Eval(Container.DataItem,
"[MemberId]").ToString() %>"
                   
class="custom" /><label for="<%#
DataBinder.Eval(Container.DataItem, "[MemberId]").ToString()
%>"><%# DataBinder.Eval(Container.DataItem, "[LastName]").ToString()
%>,
         <%#
DataBinder.Eval(Container.DataItem, "[FirstName]").ToString()
%></label>                           
           
</ItemTemplate>       
</asp:Repeater>
    </fieldset>
</div>
I have this jQuery function:
$('input:checkbox[name=chkBox]').change(function () {            
            var id =$(this).attr('id');
            //var isChecked = $(this).attr('checked');   
            var isChecked = $('#'+id).is(':checked');     
});   

How do I get the id of the checkbox that has just been clicked and tell if it is checked or unchecked by the user as the result of the click action?

Thanks