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In CExtGridWnd, I want to perform the swap of the cell.

Is there the best command?

The following snippet code moves the row with the nRowNoToMove index into the new position before the row with the nDropBeforeRowNo index:

LONG nRowNoToMove = . . .
LONG nDropBeforeRowNo  = . . .
CExtGridWnd & wndGrid  = . . .
      ASSERT( 0 <= nDropBeforeRowNo && nDropBeforeRowNo <= wndGrid.RowCountGet() );
      ASSERT( 0 <= nRowNoToMove     && nRowNoToMove     <  wndGrid.RowCountGet() );
      if( nDropBeforeRowNo <= nRowNoToMove && nRowNoToMove <= ( nDropBeforeRowNo + 1 ) )
            return . . .
CExtGridDataProvider & _DataProvider = wndGrid.OnGridQueryDataProvider();
ULONG nOffset = 0L;
      _DataProvider.CacheReservedCountsGet( NULL, &nOffset );
      VERIFY( _DataProvider.SwapDroppedSeries( false, nRowNoToMove + nOffset, nDropBeforeRowNo + nOffset, &wndGrid ) );

The snippet code above is exactly the same as grid row drag-n-drop handling code in the CExtGridWnd::OnGridOuterDragComplete() virtual method. The code snippet above implements drag-n-dropping for one grid row. The grid cells inside the grid control does not become destroyed and created again. The selection and focus are modified inside the _DataProvider.SwapDroppedSeries( . . . ) method invocation and the same cells become focused and selected. You just need to invoke this code snippet twice to swap two rows.