How to Find the Different .net version being referenced?

I am trying to find the ThreeLetterISORegionName of country "Cyprus" and "Virgin Islands". hence so I have used RegionInfo class using System.Globalization from mscorlib assembly.

ThreeLetterISORegionName

RegionInfo

System.Globalization

mscorlib

RegionInfo regionInfo = new RegionInfo("CY");
Console.WriteLine(regionInfo.ThreeLetterISORegionName);


The above code works fine in my local machine. however after deploying to production I am getting System.ArgumentException with message

System.ArgumentException

The region name CY should not correspond to neutral culture; a specific culture name is required

In my local machine and server I am using .net 4.5.2 version.
mscorlibv assembly version is 4.0.30319

.net 4.5.2

mscorlibv

4.0.30319

Any help is much appreciated. :)

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