Configuration ASP.Net Tutorial

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File: App_Code\ShoppingCartSection.cs
using System;
using System.Configuration;
namespace MyNamespace
{
    public class ShoppingCartSection : ConfigurationSection
    {
        [ConfigurationProperty("maximumItems", DefaultValue = 100, IsRequired = true)]
        public int MaximumItems
        {
            get { return (int)this["maximumItems"]; }
            set { this["maximumItems"] = value; }
        }
        [ConfigurationProperty("defaultProvider")]
        public string DefaultProvider
        {
            get { return (string)this["defaultProvider"]; }
            set { this["defaultProvider"] = value; }
        }
        [ConfigurationProperty("providers", IsDefaultCollection = false)]
        public ProviderSettingsCollection Providers
        {
            get { return (ProviderSettingsCollection)this["providers"]; }
        }
        public ShoppingCartSection(int maximumItems, string defaultProvider)
        {
            this.MaximumItems = maximumItems;
            this.DefaultProvider = defaultProvider;
        }
    }
}
File: Web.config

  
    
              name="shoppingCart"
        type="MyNamespace.ShoppingCartSection"
        allowLocation="true"
        allowDefinition="Everywhere" />
    


      maximumItems="50"
    defaultProvider="SqlShoppingCartProvider">
    
              name="SqlShoppingCartProvider"
        type="MyNamespace.SqlShoppingCartProvider" />
              name="XmlShoppingCartProvider"
        type="MyNamespace.XmlShoppingCartProvider" />