FastColoredTextBoxNS.MultiSelectionCommand.Execute C# (CSharp) Method

        public override void Execute()
        {
            commandsByRanges.Clear();
            var iChar = -1;
            ts.CurrentTB.Selection.ColumnSelectionMode = false;
            ts.CurrentTB.Selection.BeginUpdate();
            ts.CurrentTB.BeginUpdate();
            ts.CurrentTB.AllowInsertRemoveLines = false;
            try
            {
                if (cmd is InsertTextCommand)
                    ExecuteInsertTextCommand(ref iChar, (cmd as InsertTextCommand).InsertedText);
                else
                    if (cmd is InsertCharCommand && (cmd as InsertCharCommand).c != '\x0' && (cmd as InsertCharCommand).c != '\b')//if not DEL or BACKSPACE
                        ExecuteInsertTextCommand(ref iChar, (cmd as InsertCharCommand).c.ToString());
                    else
                        ExecuteCommand(ref iChar);
            }
            catch (ArgumentOutOfRangeException)
            {
            }
            finally
            {
                ts.CurrentTB.AllowInsertRemoveLines = true;
                ts.CurrentTB.EndUpdate();
                ts.CurrentTB.Selection.EndUpdate();
            }
        }