ConfigurationElement.GetCollection Method ()
Returns the default collection for the current configuration element.
Assembly: Microsoft.Web.Administration (in Microsoft.Web.Administration.dll)
A child element collection that is represented in the ChildElements property differs from a nested element collection that is represented by the return value of the method. Both collections contain ConfigurationElement objects. However, you should use the ChildElements property when you query the configuration for unique child elements such as the system.webServer/asp configuration section. You should use the method when you query the configuration for collection elements that contain a unique key or a multi-attribute key, such as the system.webServer/sites configuration section.