How to get the country code from CultureInfo?

System.Globalization.CultureInfo c = new System.Globalization.CultureInfo("en-GB");
var ri = new RegionInfo(c.Name);
string countryName = ri.DisplayName;

That will give you:

"United Kingdom"

For Two Letter Use:

string countryAbbrivation = ri.TwoLetterISORegionName;

That will give you "GB"

var c = new CultureInfo("en-GB");
var r = new RegionInfo(c.LCID);
string name = r.Name;

Most probably you need to use r.TwoLetterISORegionName property.

string regionName = r.TwoLetterISORegionName;

You can try the RegionInfo Class. One of the properties is the RegionInfo.TwoLetterISORegionName Property. Example from MSDN:

RegionInfo myRI1 = new RegionInfo("US");
Console.WriteLine( "   Name:                         {0}", myRI1.Name );
Console.WriteLine( "   ThreeLetterISORegionName:     {0}", myRI1.ThreeLetterISORegionName );
Console.WriteLine( "   TwoLetterISORegionName:       {0}", myRI1.TwoLetterISORegionName );

Name: US

ThreeLetterISORegionName: USA

TwoLetterISORegionName: US