Create Custom Application Block Using .NET Enterprise Library

using System;
using System.Configuration;

using Microsoft.Practices.EnterpriseLibrary.Common.Configuration;
using Project.Practice.DB;
namespace Project.Practice.DB.Configuration
{
    public class DBSettings : SerializableConfigurationSection
    {
        public const string SectionName = "dbConfiguration";
        private const string DBProvidersProviderProperty = "dbProviders";
        private const string DefaultDBProviderProperty = "defaultDBProvider";
        public DBSettings() { }


        [ConfigurationProperty(DBProvidersProviderProperty, IsRequired = true)]
        public NameTypeConfigurationElementCollection<DBData> DBProviders
        {
            get { return (NameTypeConfigurationElementCollection<DBData>)base[DBProvidersProviderProperty]; }
        }

        [ConfigurationProperty(DefaultDBProviderProperty, IsRequired = true)]
        public string DefaultDBProvider
        {
            get { return (string)base[DefaultDBProviderProperty]; }
        }
    }
}