System.Collections.Generic.HashSet does not work as advertised

Question

Consider following code which demonstrates the usage of System.Collections.Generic.HashSet:

HashSet does not hash the key's value when doing "contains" lookup. If we change the key's value, it has no bearing on the lookup.

Answer 1

the value stored in the hash set is an object (integer array) reference. Changing an array element does not change the array’s reference. You would need to recreate the array itself to change its value.

Dim v = key ‘v references key
key(1) = 6
if v = key then 
    MessageBox.Show(“still match”)
end if

Note: if the array was a read only .net structure, then changing an element value would change the value. But I believe this is only available in c#.