Um...you can't declare four different values as the same name at all, let alone try and "loop" on them - it doesn't work.
It's like trying to take 4 dvds and push them all into a dvd player that only takes one - something is going to break!
If you want a number of values to use in you method, I suggest that you start looking at an array instead:
https://msdn.microsoft.com/en-us/library/wak0wfyt.aspx[
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