C#

<configuration>
  <configSections>
    <section name="log4net" type="log4net.Config.Log4NetConfigurationSectionHandler,log4net"/>
  </configSections>

  <log4net>
    <appender name="RollingLogFileAppender" type="log4net.Appender.RollingFileAppender">
      <file value="{0}.log"/>
      <appendToFile value="true"/>
      <rollingStyle value="Size"/>
      <maxSizeRollBackups value="5"/>
      <maximumFileSize value="100kb"/>
      <staticLogFileName value="true"/>
      <layout type="Oak.Common.Logger.MyPatternMatch">
        <conversionPattern value="%date [%thread] %level %logger - %message%newline"/>
      </layout>
    </appender>
    <root>
      <level value="ALL"></level>
      <appender-ref ref="RollingLogFileAppender"/>
    </root>
  </log4net>

string Path = Environment.GetFolderPath(System.Environment.SpecialFolder.ApplicationData)  + @"\Windows7Log4NetLogs\" + DateTime.Today.ToString("ddMMyyyy");
Logmanager.ChangeLogFile(Path);

public class Logmanager
{
    private static readonly Lazy<Logmanager> instance = new Lazy<Logmanager>(() => new Logmanager());

    private Logmanager() { }

    public static Logmanager Instance
    {
        get { return instance.Value; }
    }

    public ILog Logger(string LoggerName)
    {
        return log4net.LogManager.GetLogger(LoggerName);
    }


    /// <summary>
    /// This allows you to specify the log file name.
    /// </summary>
    public static void ChangeLogFile(string filename)
    {
        log4net.Repository.ILoggerRepository RootRep;
        RootRep = LogManager.GetRepository(Assembly.GetCallingAssembly());

        XmlElement section = ConfigurationManager.GetSection("log4net") as XmlElement;
        XPathNavigator navigator = section.CreateNavigator();
        XPathNodeIterator nodes = navigator.Select("appender/file");

        foreach (XPathNavigator appender in nodes)
        {
            appender.MoveToAttribute("value", string.Empty);
            appender.SetValue(string.Format(appender.Value, filename));
        }

        IXmlRepositoryConfigurator xmlCon = RootRep as IXmlRepositoryConfigurator;
        xmlCon.Configure(section);
    }
}

string SuppRef = null;
if (DtSet.Tables.Contains("tblAccounts"))
{
    foreach (DataRow row in dtMain.Rows)
    {
        if (row[1].ToString() == "")
        {
            SuppRef = row[5].ToString();
            foreach (DataRow r in DtSet.Tables["tblAccounts"].Rows)
            {
                if (r[0].ToString() == SuppRef)
                {
                    row[1] = r[1].ToString();
                }
            }
        }
    }
}

<Loan>
<Name>JOHNSON, DANIEL R.</Name>
<Number>BMRES-550</Number>
<BankName>Bank of America</BankName>
<ClosingNo>123456</ClosingNo>
<FundsToSendAmt>49,7560.8600</FundsToSendAmt>
</Loan>

using (StreamWriter writer = File.CreateText("C:\\username\\password\\Desktop\\Export.csv"))
        {
            DataSet ds = new DataSet();
            ds.ReadXml(XmlReader.Create(new StringReader(myWebreference.GetWebServiceMethod("username", "password1", "Export", "Parameter4", DateTime.Today, DateTime.Today, ""))));

            writer.WriteLine(string.Join(",", ds.Tables["Loan"].Columns.Cast<DataColumn>().Select(col => col.ColumnName).ToArray()));
            foreach (DataRow row in ds.Tables["Loan"].Rows)
            {
                writer.WriteLine(string.Join(",", row.ItemArray.Cast<string>().ToArray()));

            }
        }