sharp-chat/SharpChat/Packet/UserUpdateNotificationPacket.cs

using System;

namespace SharpChat.Packet {
    public class UserUpdateNotificationPacket : ServerPacket {
        public string PreviousName { get; private set; }
        public string NewName { get; private set; }
        public DateTimeOffset Timestamp { get; }

        public UserUpdateNotificationPacket(string previousName, string newName) {
            PreviousName = previousName ?? throw new ArgumentNullException(nameof(previousName));
            NewName = newName ?? throw new ArgumentNullException(nameof(newName));
            Timestamp = DateTimeOffset.Now;
        }

        public override string Pack() {
            return string.Format(
                "2\t{0}\t-1\t0\fnick\f{1}\f{2}\t{3}\t10010",
                Timestamp.ToUnixTimeSeconds(),
                PreviousName,
                NewName,
                SequenceId
            );
        }
    }
}