System.Configuration.ConfigurationPropertyCollection.Add C# (CSharp) Method

        public void Add(ConfigurationProperty property) {
            if (Contains(property.Name) != true) {
                _items.Add(property);
            }
        }

        static FormsAuthConfigurationSection() 
        {
            _properties = new ConfigurationPropertyCollection();

            _properties.Add(_propEnabled);
            _properties.Add(_propUseIISUser);
        }