<configSections>
<section name="customProvider" type="DatabaseProvider.HiSection,DatabaseProvider"/>
      </sectionGroup>
    </configSections>
    <customProvider defaultProvider="SqlHiProvider">
      <providers>
        <add name="SqlHiProvider" type="DataBaseProvider.SqlArticleProvider,DatabaseProvider"></add>
      </providers>
    </customProvider>

namespace DatabaseProvider
{
    public class HiSection : ConfigurationSection
    {
        /// <summary>
        /// A collection of registered providers.
        /// </summary>
        [ConfigurationProperty("providers")]
        public ProviderSettingsCollection Providers
        {
            get { return (ProviderSettingsCollection)base["providers"]; }
        }

        [StringValidator(MinLength = 1)]
        [ConfigurationProperty("defaultProvider", DefaultValue = "SqlHiProvider")]
        public string DefaultProvider
        {
            get { return (string)base["defaultProvider"]; }
            set { base["defaultProvider"] = value; }
        }
    }
}