c# - How to make a dropdown list of all cultures (but no repeats) -

i'm trying make 2 dropdown lists.

the top 1 offers cultures, (but no repeats). example: english, spanish, filipino

after selecting top list bottom list show specific types.

i right use code top list.

foreach (cultureinfo cultureinfo in cultureinfo.getcultures(culturetypes.neutralcultures)) 

however not show filipino (philippines) i'd rather not use getcultures(culturetypes.allcultures)) because shows many @ once.

it seems may need load neutralcultures ilist. iterate through allcultures make sure it's threeletterisolanguagename in list, if not add it.

there best practice this?

thanks

look @ reference different culturetypes values. tells included each.

i guess want that's in specific cultures? either combine non-specific cultures set or cultures , exclude specific ones. second approach easiest express in linq:

var cultures = cultureinfo.getcultures(culturetypes.allcultures)                           .except(cultureinfo.getcultures(culturetypes.specificcultures));