ConfigurationElement.GetCollection Method (Type)
Returns the configuration element that has the specified type and is under the current configuration element.
Assembly: Microsoft.Web.Administration (in Microsoft.Web.Administration.dll)
The common language runtime (CLR) type of the collection this method should return.
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 GetCollection 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 GetCollection 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