dropdownlist data value need to be used to test condition then doing update query

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ASP.NET

hello sir,

i have one problem.i have one dropdownlist which has been populated by using some condition which is are as follows:

1)zone_num has to be populated only for zone_type=25 and if exlude_at_ass=n then it is conveyable and drop downlist show zone_num field:conveyable.
2)if exclude_at_ass=y then it should show zone_num:nonconveyable

after populating datavalue in dropdownlist

a person will select conveyable or non conveyable field .

when perticulor conveyable field associated with perticulor zone_num field associated with zone_type and exxclude_at_ass is selected it should update temp_control=n

when perticulor nonconveyable field associated with perticulor zone_num field associated with zone_type and exxclude_at_ass is selected it should update temp_control=y.


i'm not able to build logic so please help me out