checkbox in aspx

hi

hi

i am doing my web page in asp.net
i have problem with check box.here i am explaining detailly

i have 2 arrays both contains some names.second array is subset of fisrt one.
explamle first array contains 100 names and second one contains 20 names.
i want to show the names of first array with check box option.if names of first array exist in second array
i want to show check box with checked option.other wise checkbox will be unchecked.i did it in asp (like below example)
and working fine.


flag=false
for i=0 to firstarr.count-1
for j=0 to secondarr.count-1
if trim(firstarr.item(i))=trim( secondarr.item(j)) then
flag=true
exit for
end if
next
if flag=true then
<td><input type=CheckBox ID="firstarr<%=i%>" checked value="1"><%=firstarr.item(i)%></td>

else
<td><input type=CheckBox ID="firstarr<%=i%>" value="0"><%=firstarr.item(i)%></td>
end if
flag=false
next





but aspx its giving problem.because in asp:checkbox is not allowing duplicate id and also not allowing dynamically assaiging

id dynamically like

<%if flag=true then%>

<td><asp:CheckBox Runat =server ID="firstarr<%=i%>" checked /><%=firstarr.item(i)%></td>
<%else%>

<td><asp:CheckBox runat=server ID="firstarr<%=i%>" /><%=firstarr.item(i)%></td>

<%end if%>


i need the id because later i want to do updates in the database based on this ids.

i hope i cleared the problem.pl advice me
thanks sr

u'd better post it in the asp.net forum instead of this one :P

soz cant help ya with .net tho