using System; namespace Billing; internal static class Helper { public static void Debug(string message) { var time = DateTime.Now.ToString("HH:mm:ss.fff"); System.Diagnostics.Debug.WriteLine($"[{time}] - {message}"); } public static void Error(string category, Exception ex) { Error(category, ex?.Message ?? "unknown error"); } public static void Error(string category, string message) { var time = DateTime.Now.ToString("HH:mm:ss.fff"); System.Diagnostics.Debug.Fail($"[{time}] - {category}", message); } }