vb.net - Passing structure to a procedure as ByValue, however the procedure changes original structure values -

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i want ask vb.net code. i'm suffering problem lot. please answer me if know solution of question or give me comments. 

'declare structure "gene"     public structure gene     dim seq() integer     end structure  'here procedure, changes original value.         public sub mutation(byval originalgene gene, byref targetgene gene)         dim p1 integer         dim p2 integer         dim temp integer          p1 = int((n_jobs - 1 + 1) * rnd(rndnum) + 0)         p2 = int((n_jobs - 1 + 1) * rnd(rndnum + 1) + 0)          targetgene.seq = originalgene.seq          temp = targetgene.seq(p1)         targetgene.seq(p1) = targetgene.seq(p2)         targetgene.seq(p2) = temp         end sub

it's not changing structure. structure contains pointer array. reference array same though can have unlimited number of copies of structure.

example of immutable gene class:

public class gene     private _sequence() integer     public sub new(sequence() integer)         _sequence = sequence     end sub     public function getsequence() integer()         return _sequence.select(function (x) x).toarray()     end function     public function mutate() gene         dim sequence() integer = me.getsequence()          dim p1 integer         dim p2 integer         dim temp integer          p1 = int((n_jobs - 1 + 1) * rnd(rndnum) + 0)         p2 = int((n_jobs - 1 + 1) * rnd(rndnum + 1) + 0)          targetgene.seq = originalgene.seq          temp = sequence(p1)         sequence(p1) = sequence(p2)         sequence(p2) = temp          return new gene(sequence)     end function end class

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