gistfile1.cs

// declaration

    public class ServiceLogger : IServiceLogger
    {
        private readonly ILog log;

        public ServiceLogger(object o)
        {
            log = LogManager.GetLogger(o.GetType().Name);
        }

        public void Write(string message, params object[] args)
        {
            log.InfoFormat(message, args);
        }

        public void WriteToExceptionCategory(string message, params object[] args)
        {
            log.ErrorFormat(message, args);
        }
    }


    public static class LoggerExtensions
    {
        public static IServiceLogger GetLogger(this object o)
        {
            return new ServiceLogger(o);
        }
    }

// usage
this.GetLogger().WriteToExceptionCategory("Error while opening connection: {0}", ex.Message);