public static void Main()
Console.WriteLine("Hello World");
var x = new System.Globalization.RegionInfo("en-us");
Console.WriteLine(x.TwoLetterISORegionName);
Console.WriteLine(x.ThreeLetterISORegionName);
x = new System.Globalization.RegionInfo("US");
Console.WriteLine(x.TwoLetterISORegionName);
Console.WriteLine(x.ThreeLetterISORegionName);