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System.Text.Encoding.UTF8.GetBytes("すきな文字").Select(x => string.Format("{0:X}", x)).Aggregate("", (acum, x) => acum += x + " ").Trim();
System.Text.Encoding.UTF8.GetString("FF FF FF FF FF".Split(new char[]{' '}).Select(x => Convert.ToByte(x, 16)).ToArray());