Lightswitch Choice List changer based other column condition

Question

I have a table called Members on my Lightswitch application.

I want to add a choice list for MemberType (String) that be related to my isAEDSMember (boolean) column.

isAEDSMember (Boolean)
if(isAEDSMember == true){
myChoiceList {1,2,3,4}
}else{
myChoiceList {3,4}
}

I think it's possible only with c# code. currently i don't have any idea about the method and syntax of making this option.