.NET 2.0 Configuration AppSettings In Custom Section

App.config or Web.config:

<?xml version="1.0"?>
<configuration>
  <configSections>
    <section name="MyCustomSection" type="CustomSettingManager, ConsoleApplication1"/>
  </configSections>
  <MyCustomSection>
    <appSettings>
      <add key="Key1" value="Value1"/>
      <add key="Key2" value="Value2"/>
    </appSettings>
  </MyCustomSection>
</configuration>

Code behind:

using System;
using System.Configuration;

class Test
{
    static void Main()
    {
        Console.WriteLine("Key:{0} Value:{1}", "key1", CustomSettingManager.GetCustomSetting("key1"));
        Console.Read();
    }
}

public class CustomSettingElement : ConfigurationElement
{
    [ConfigurationProperty("key", IsRequired = true)]
    public string Key
    {
        get { return this["key"] as string; }
    }
    [ConfigurationProperty("value", IsRequired = true)]
    public string Value
    {
        get { return this["value"] as string; }
    }
}

public class CustomSettingCollection : ConfigurationElementCollection
{
    public CustomSettingElement this[int index]
    {
        get
        {
            return base.BaseGet(index) as CustomSettingElement;
        }
        set
        {
            if (base.BaseGet(index) != null)
            {
                base.BaseRemoveAt(index);
            }
            this.BaseAdd(index, value);
        }
    }

    protected override ConfigurationElement CreateNewElement()
    {
        return new CustomSettingElement();
    }

    protected override object GetElementKey(ConfigurationElement element)
    {
        return ((CustomSettingElement)element).Key;
    }
}

public class CustomSettingManager : ConfigurationSection
{
    private const string sectionName = "MyCustomSection";
    private const string collectionName = "appSettings";
    private static CustomSettingManager configSection =
        ConfigurationManager.GetSection(sectionName) as CustomSettingManager;

    public static string GetCustomSetting(string key)
    {
        string value = string.Empty;
        if (configSection != null && configSection[collectionName] != null)
        {
            CustomSettingCollection appSettings =
                configSection[collectionName] as CustomSettingCollection;
            foreach (CustomSettingElement item in appSettings)
            {
                if (string.Compare(item.Key, key, true) == 0)
                {
                    value = item.Value;
                }
            }
        }
        return value;
    }

    [ConfigurationProperty(collectionName)]
    public CustomSettingCollection AppSettings
    {
        get
        {
            return this[collectionName] as CustomSettingCollection;
        }
    }
}