记录日志解决思路

记录日志
现在需要对webservice的每个接口都要记录日志，下面的代码合理吗？
请大家给我一点建议，谢谢。

C# code

private WebLog log=null;[WebMethod]Public DataSet ds(){log=new WebLog();log.ServiceName="WebService";log.StartTime=DateTime.Parse(System.DateTime.Now.ToString());//连接数据库，最后返回dslog.EndTime=DateTime.Parse(System.DateTime.Now.ToString());WebWriteLog.Log(log);return ds;}[WebMethod]Public String str(){log=new WebLog();log.ServiceName="WebService";log.StartTime=DateTime.Parse(System.DateTime.Now.ToString());//连接数据库，最后返回Stringlog.EndTime=DateTime.Parse(System.DateTime.Now.ToString());LogWrite.LogWriteMethod(log);return str;}//实体类://BLL写日志public class LogWrite{    public static  int LogWriteMethod(Log log)    {        string sel="Insert into tb values (@StartTime,@ServiceName,@EndTime);";        try        {            SqlParameter[] paras = new SqlParameter[]                                                 {                                                      new SqlParameter("@StartTime", log.StartTime),                                                    new SqlParameter("@ServiceName", log.ServiceName),                                                     new SqlParameter("@EndTime", log.EndTime)                                                               };            int rows = DbHelper.ExecuteNonQuery(sel, paras);            return rows;        }        catch        {            return 0;        }        }           }DAL:        public static int ExecuteNonQuery(string sql, SqlParameter[] paras)        {            try            {                using (SqlConnection conn= new SqlConnection())                {                    conn.Open();                    SqlCommand cmd = new SqlCommand(sql, con)                    cmd.Parameters.AddRange(paras);                    return cmd.ExecuteNonQuery();                }            }            catch (Exception E)            {                throw E;            }        }