Config another better example

<?xml version="1.0" encoding="utf-8" ?>

<configuration>
  <!--<configSections>
    --><!--<sectionGroup name="MyFirstSection"
    type="DBConnectionStringDemo.MyFirstSectionHandler,
DBConnectionStringDemo"/>--><!--
    <sectionGroup name="MyFirstSection"/>
  </configSections>
  <MyFirstSection>
    <DemoValues>
      <Value>
        <Identifier>111</Identifier>
        <SettingValue>System.Data.SqlClient</SettingValue>
      </Value>
      <Value>
        <Identifier>112</Identifier>
        <SettingValue>System.Data.OleDb</SettingValue>
      </Value>
      <Value>
        <Identifier>113</Identifier>
        <SettingValue>System.Data.Odbc</SettingValue>
      </Value>
    </DemoValues>
  </MyFirstSection>-->
  <appSettings>
    <add key="Foo" value="Hello World!"/>
  </appSettings>
  <connectionStrings>
    <clear/>
    <add name="AdventureWorksString"
    providerName="System.Data.SqlClient"
    connectionString="Data Source=localhost;Initial Catalog=AdventureWorks;
Integrated Security=true"/>
    <add name="MarsEnabledSqlServer2005String"
    providerName="System.Data.SqlClient"
    connectionString="Server=Aron1;Database=pubs;
Trusted_Connection=True;MultipleActiveResultSets=true" />
    <add name="NorthWindConnectionString"
         providerName="System.Data.SqlClient"
    connectionString="Data Source=.\SQLEXPRESS;AttachDbFilename=C:\Users\Noel\SQLExpressDataFiles\NORTHWIND.MDF;Integrated Security=True;Connect Timeout=30;User Instance=True"/>
  </connectionStrings>
    <system.diagnostics>
      <assert assertuienabled="false" logfilename="C:\\Users\\Noel\\Documents\\myAssertFile.txt" />
    </system.diagnostics>


  </configuration>
using System;
using System.Collections.Generic;
using System.Text;
using System.Configuration;
using System.Diagnostics;
using System.IO;
using System.Collections.Specialized;

namespace ConfigApplication
{
    class Program
    {
        static void Main(string[] args)
        {
            ExeConfigurationFileMap ecfm = new ExeConfigurationFileMap ();
            ecfm.ExeConfigFilename = @".\ConfigApplication.exe.config";
            System.Diagnostics.Debug.Assert(File.Exists(ecfm.ExeConfigFilename),
            "The mapped file or path is missing or incorrect!");
            Configuration c = ConfigurationManager.OpenMappedExeConfiguration(ecfm,
                ConfigurationUserLevel.None);
            NameValueCollection AllAppSettings = ConfigurationManager.AppSettings;
            Console.WriteLine(AllAppSettings["Foo"]);
            Console.WriteLine(AllAppSettings[0]);
           
            ConnectionStringSettingsCollection MySettings = ConfigurationManager.ConnectionStrings;
            if (MySettings != null)
            {
                StringBuilder sb = new StringBuilder();
                foreach (ConnectionStringSettings individualSettings in MySettings)
                {
                    sb.Append("Full Connection String: " +
                    individualSettings.ConnectionString + "\r\n");
                    sb.Append("Provider Name: " + individualSettings.ProviderName + "\r\n");
                    sb.Append("Section Name: " + individualSettings.Name + "\r\n");
                }
                Console.WriteLine(sb.ToString());
                
            }