From downlist select item value respective name to be displayed in the listbox

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C#

Faculty table as follows

Facid    Facname
  1       Ram
  2       Suresh
  3       Vignesh
  4       Rajesh

Bthfac table as follows

Bthid    Bthid    Facid
  1        1       1,2,3
  2        2       3,4
  3        3       2,4

Run mode screen has follows;
Facid dropdownlist
Listbox


in the dropdownlist i displayed facid from the Bthfac table in that dropdownlist.

for example when i select the facid 1,23 in the dropdownlist, i want to display the facname in the list box.

for that how can i do using asp.net in c#

Run mode example as follows
Facid 1,2,3 (select in the dropdownlist)

i want to display the particular facname in the listbox. listbox shown below
Listbox ram
suresh
vignesh

for that how can i do?


please help me.

Regards,
Narasiman P.