FastColoredTextBoxNS.FileTextSource.this C# (CSharp) Method

        public override Line this[int i]
        {
            get
            {
                if (base.lines[i] != null)
                    return lines[i];
                else
                    LoadLineFromSourceFile(i);

                return lines[i];
            }
            set
            {
                throw new NotImplementedException();
            }
        }