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The RegionInfo.ThreeLetterISORegionName property contains the three-letter code defined in ISO 3166 for this country/region. For example, the three-letter code for United States is "USA".
Case is not significant. However, the RegionInfo.Name, the RegionInfo.TwoLetterISORegionName, and the RegionInfo.ThreeLetterISORegionName properties return the appropriate code in uppercase.