C# Convert string from UTF-8 to ISO-8859-1 (Latin1) H

I have googled on this topic and I have looked at every answer, but I still don't get it.

Basically I need to convert UTF-8 string to ISO-8859-1 and I do it using following code:

Encoding iso = Encoding.GetEncoding("ISO-8859-1");Encoding utf8 = Encoding.UTF8;string msg = iso.GetString(utf8.GetBytes(Message));

My source string is

Message = "ÄäÖöÕõÜü"

But unfortunately my result string becomes

msg = "�ä�ö�õ�ü

What I'm doing wrong here?