Problem with reading consistent Language readings from device from within universal app

Friends,
I am working against a Class a wrote the other day. But I get unconsistent Uri results after pulling language and region on windows/Phone?!
As a beginner to all this, great of someone could tell me whats going on;
public void SetLanguageCode()
GeographicRegion userRegion = new GeographicRegion();
string LocalLanguageString = userRegion.CodeTwoLetter;
string LocalLanguage = Windows.Globalization.Language.CurrentInputMethodLanguageTag;
// string for NavigationUrl
string LocalLanguageID = LocalLanguage + "-" + LocalLanguageString;
Uri TestUriBase = new Uri("http://test.test.com/");
Uri UserUri = new Uri(TestUriBase, LocalLanguageID);
UriBuilder UrlBuild = new UriBuilder(UserUri);
Uri UriFinal = UrlBuild.Uri;
_languageCode = UriFinal.ToString();
Last field _languageCode returns "buggy" Uri on some regions/devices. How could you feed it a more static/solid language reading than above?
Thanks again for any pointers...
Regards, Kato.

Thanks for taking the time here;
To your question - its not correct.
But my problem is this - if I change my regional/keyboard settings to "Norwegian" - away from your US.
I get a string that is working and is correct;
http://test.test.com/nb-NO
But to get YOUR US Region to work - I need to tweak this line with commenting out the end;
string LocalLanguageID =
LocalLanguage; // +
"-" + LocalLanguageString;
And then its suddenly correct, but wrong if I change the region/language again to something "Scandenavian"...Then the final Uri for "_languageCode" is to short - like
http://test.test.com/nb
Which results in a "en-US Setting" - when hitting my MVC site from my App.
My MVC site that will answer to this "Uri" request from the app, has a fallback to "en-US", which is great if the Region/Language is missing/not offered. But now my final "_languageCode" field seems to change
its pattern based on different regions?!
And sometime it seems to give me a mix of region/language too?! Like this;
"http://test.test.com/en-US-NO"
So whatever pointers anyone has here?!
Thanks.
Regards, Kato.

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