System.Configuration.ProviderSettingsCollection.this C# (CSharp) Method

        public ProviderSettings this[int index]
        {
            get
            {
                return (ProviderSettings)BaseGet(index);
            }
            set
            {
                if (BaseGet(index) != null)
                    BaseRemoveAt(index);

                BaseAdd(index,value);
            }
        }
    }