[Serializable]
public class PacketParseException : Exception
{
    public byte[] ByteData
    {
        get
        {
            return (byte[])this.Data["ByteData"];
        }
    }

    public PacketParseException(string message, byte[] data, Exception inner) : base(message, inner)
    {
        this.Data.Add("ByteData", data);
    }
}

public class BetterException : Exception
{
    protected T GetValue<T>([CallerMemberNameAttribute] string propertyName = "")
    {
        return (T)Data[propertyName];
    }

    protected void SetValue<T>(T value, [CallerMemberNameAttribute] string propertyName = "")
    {
        Data[propertyName] = value;
    }
}