SourceGrid.GridVirtual.ClearValues C# (CSharp) Method

        public virtual void ClearValues(RangeRegion region)
        {
            PositionCollection positions = region.GetCellsPositions();
            foreach (Position pos in positions)
            {
                CellContext cellContext = new CellContext(this, pos);
                if (cellContext.Cell != null)
                {
                    if (cellContext.Cell.Editor != null)
                        cellContext.Cell.Editor.ClearCell(cellContext);
                }
            }
        }

        /// <summary>
        /// Load the specified range data into a string array. This method use the cell editor to get the value.
        /// </summary>
        /// <param name="sourceGrid"></param>
        /// <param name="sourceRange"></param>
        /// <param name="startDragPosition">Starting drag position. Used only for calculating drop destination range.</param>
        /// <param name="cutMode">Cut mode. Can be used to remove the data from the source when pasting it to the destination or immediately.</param>
        public void LoadData(GridVirtual sourceGrid, Range sourceRange, Position startDragPosition, CutMode cutMode)
        {
            mSourceGrid = sourceGrid;
            mCutMode = cutMode;
            mStartDragPosition = startDragPosition;
            mSourceRange = sourceRange;
            mSourceValues = new string[mSourceRange.RowsCount, mSourceRange.ColumnsCount];

            int arrayRow = 0;
            for (int r = mSourceRange.Start.Row; r <= mSourceRange.End.Row; r++, arrayRow++)
            {
                int arrayCol = 0;
                for (int c = mSourceRange.Start.Column; c <= mSourceRange.End.Column; c++, arrayCol++)
                {
                    Position posCell = new Position(r, c);
                    Cells.ICellVirtual cell = sourceGrid.GetCell(posCell);
                    CellContext cellContext = new CellContext(sourceGrid, posCell, cell);
                    if (cell != null && cell.Editor != null && cell.Editor.IsStringConversionSupported())
                        mSourceValues[arrayRow, arrayCol] = cell.Editor.ValueToString( cell.Model.ValueModel.GetValue(cellContext) );
                    else if (cell != null)
                        mSourceValues[arrayRow, arrayCol] = cellContext.DisplayText;
                }
            }

            //Cut Data
            if (CutMode == CutMode.CutImmediately && sourceGrid != null)
            {
                sourceGrid.ClearValues(new RangeRegion(sourceRange));
                //for (int sr = sourceRange.Start.Row; sr <= sourceRange.End.Row; sr++)
                //    for (int sc = sourceRange.Start.Column; sc <= sourceRange.End.Column; sc++)
                //    {
                //        Position pos = new Position(sr, sc);
                //        Cells.ICellVirtual cell = sourceGrid.GetCell(sr, sc);
                //        CellContext cellContext = new CellContext(sourceGrid, pos, cell);
                //        if (cell.Editor != null)
                //            cell.Editor.ClearCell(cellContext);
                //    }
            }

            mClipboardDataObject = new System.Windows.Forms.DataObject();
            mClipboardDataObject.SetData(RANGEDATA_FORMAT, this);
            mClipboardDataObject.SetData(typeof(string), DataToString(mSourceValues, mSourceRange));
        }