System.Collections.ArrayList.this C# (CSharp) Method

        public virtual Object this[int index]
        {
            get
            {
                if (index < 0 || index >= _size) throw new ArgumentOutOfRangeException(nameof(index), SR.ArgumentOutOfRange_Index);
                Contract.EndContractBlock();
                return _items[index];
            }
            set
            {
                if (index < 0 || index >= _size) throw new ArgumentOutOfRangeException(nameof(index), SR.ArgumentOutOfRange_Index);
                Contract.EndContractBlock();
                _items[index] = value;
                _version++;
            }
        }