Logger.cs

public class Logger
{

    public static void Log(object msg, bool newLine = true)
    {
        string message = "<" + DateTime.Now.ToString() + "> " + msg.ToString() + ((newLine) ? "\n" : "");

        Console.Write(message);

        LogFile(message, _getFileName());
    }

    public static void Log(Exception ex)
    {
        string message = "<" + DateTime.Now.ToString() + "> " + ex.ToString();

        Console.Write(message);

        LogFile(message, _getFileName());
    }

    public static void LogFile(object msg, string filename, bool append = true)
    {
        try
        {
            if (append)
            {
                File.AppendAllText(filename, "\r\n<" + DateTime.Now.ToString() + "> " + msg.ToString());
            }
            else
            {
                File.WriteAllText(filename, "\r\n<" + DateTime.Now.ToString() + "> " + msg.ToString());
            }
        } catch { }            
    }

    private static string _getFileName()
    {
        return "log_" + DateTime.Now.Year + "-" + DateTime.Now.Month + "-" + DateTime.Now.Day + ".log";
    }

}