namespace System { internal static class HexConverter { public enum Casing : uint { Upper = 0, Lower = 8224 } public static void ToBytesBuffer(byte value, Span<byte> buffer, int startingIndex = 0, Casing casing = Casing.Upper); public static void ToCharsBuffer(byte value, Span<char> buffer, int startingIndex = 0, Casing casing = Casing.Upper); public static char ToCharUpper(int value); } }