FastColoredTextBoxNS.ReplaceTextCommand.Execute C# (CSharp) Method

        public override void Execute()
        {
            var tb = ts.CurrentTB;
            prevText.Clear();

            ts.OnTextChanging(ref insertedText);

            tb.Selection.BeginUpdate();
            tb.BeginUpdate();
            for (int i = ranges.Count - 1; i >= 0; i--)
            {
                tb.Selection.Start = ranges[i].Start;
                tb.Selection.End = ranges[i].End;
                prevText.Add(tb.Selection.Text);
                ClearSelected(ts);
                if (insertedText  != "")
                    InsertTextCommand.InsertText(insertedText, ts);
            }
            if(ranges.Count > 0)
                ts.OnTextChanged(ranges[0].Start.iLine, ranges[ranges.Count - 1].End.iLine);
            tb.EndUpdate();
            tb.Selection.EndUpdate();
            ts.NeedRecalc(new TextSource.TextChangedEventArgs(0, 1));

            lastSel = new RangeInfo(tb.Selection);
        }