How to get ISO 3166 Country Code from CultureInfo in .NET

Question

Given a CultureInfo object, how do I get the two character ISO 3166 Country Code? Eg from en-US , I want US and from en-GB , I want GB . I also need to handle cases where the culture may not have a country code.

Answer 1

Use RegionInfo-class to retrieve two (or three) letter iso region name:

RegionInfo usa = new RegionInfo("en-US");           
string isoUSA = usa.TwoLetterISORegionName;

RegionInfo gb = new RegionInfo("en-GB");
string isoGB = gb.TwoLetterISORegionName;

You might want to catch possible exception that will happen if you try to pass invalid value to the constructor.