How to create all subset of a set in C#?

Question

I mean if user add  the amount of a set  and add his/ her numbers at the end compiler gives and calculate all of the subsets of the set which have been created.

 

for example: 

size of set: 3 

parameters of set: 5 , 3, 2

 

result:  {5} ,{3} , {3,2} , {2} , {} , {3,5,2} , {5,2} , {3,5}