Logging in .net

1)Good logging module - like log4net
2)Good logging format code so that reading the log to find out
error is easier-- find out!!
eg: datetime :classname :method Name :message

3) Simple logging code is shown below

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.IO;
 
namespace Common
{
    public class Logger    {
        private static string _logFileName = string.Empty;
 
        /// <summary>        /// Create a statis logger instance for your project        /// </summary>        /// <param name="filename">Log file name</param>        public Logger(string filename = "log.txt")
        {
            _logFileName = filename;
        }
 
        /// <summary>        /// Used to log an exception information        /// </summary>        /// <param name="ex"></param>        /// <param name="classname"></param>        /// <param name="methodName"></param>        /// <param name="msg"></param>        public void WriteEx(Exception ex, string classname = "", string methodName = "", string msg = "")
        {
            try            {
                StreamWriter sw = new StreamWriter(_logFileName, true);
                sw.WriteLine(string.Format("{0} : {1} : {2} : {3} : {4} ", 
                              DateTime.UtcNow.ToShortDateString(), classname, methodName, ex.Message, msg));
            }
            catch            {
                //Do nothing            }
        }
 
        /// <summary>        /// Used to log any information        /// </summary>        /// <param name="ex"></param>        /// <param name="classname"></param>        /// <param name="methodName"></param>        /// <param name="msg"></param>        public void WriteMsg(string msg, string classname = "", string methodName = "")
        {
            try            {
                StreamWriter sw = new StreamWriter(_logFileName, true);
                sw.WriteLine(string.Format("{0} : {1} : {2} : {3} ",
                              DateTime.UtcNow.ToShortDateString(), classname, methodName, msg));
 
            }
            catch            {
                //Do nothing            }
        }
    }
}

to be continued...