dotnet-core/release-notes/2.1/api-diff/2.0-vs-2.1_System.Globalization.md

System.Globalization

 namespace System.Globalization {
     public static class CharUnicodeInfo {
+        public static UnicodeCategory GetUnicodeCategory(int codePoint);
     }
-    public class CultureNotFoundException : ArgumentException, ISerializable
+    public class CultureNotFoundException : ArgumentException
 }