ConfigurationCollectionAttribute public sealed class ConfigurationCollectionAttribute : Attribute Used on classes derived from ConfigurationElementCollection. Specifies the collection item type and verbs used for add/remove/clear. Documentation Code public string AddItemName { get; set; } public string ClearItemsName { get; set; } public ConfigurationElementCollectionType CollectionType { get; set; } public Type ItemType { get; } public string RemoveItemName { get; set; } public ConfigurationCollectionAttribute(Type itemType)