Anti-Patterns and Worst Practices – Utils Class

MoreUtils.cs

public static class Utils
{
    public static string CreateShippingMessage(DayOfWeek dayOfWeek, TimeSpan currentTime)
    {
        var message = "Your package will be delivered ";
        if (dayOfWeek >= DayOfWeek.Monday && dayOfWeek <= DayOfWeek.Thursday)
            message += currentTime < new TimeSpan(0, 17, 45, 0) ? "today" : "tomorrow";
        else
            message += "soon";
        return message;
    }
}

Utils.cs

public static class Utils
{
    private const string _filePath = "logfile.txt";

    public static void LogMessage(string message)
    {
        using(TextWriter writer = File.AppendText(_filePath))
        {
            writer.WriteLine(message);
        }
    }

    public static void LogException(Exception ex)
    {
        using (TextWriter writer = File.AppendText(_filePath))
        {
            writer.WriteLine(ex.Message);
        }
    }
}