How To Achieve Excel Like Fill Selection In WPF Datagrid (Sfdatagrid)?

//You can assign GridCellSelectionController here for cell selection.
this.datagrid.SelectionController = new GridCellSelectionControlExt(this.datagrid);

// Custom selection controller for cell selection
public class GridCellSelectionControlExt : GridCellSelectionController
{
    private bool isDragged;
    private List<GridCellInfo> selectedCells;
    public GridCellSelectionControlExt(SfDataGrid dataGrid)
        : base(dataGrid)
    {
    }

    protected override void ProcessDragSelection(MouseEventArgs args, Syncfusion.UI.Xaml.ScrollAxis.RowColumnIndex rowColumnIndex)
    {
        isDragged = true;
        base.ProcessDragSelection(args, rowColumnIndex);
    }

    protected override void ProcessPointerReleased(MouseButtonEventArgs args, Syncfusion.UI.Xaml.ScrollAxis.RowColumnIndex rowColumnIndex)
    {
        base.ProcessPointerReleased(args, rowColumnIndex);

        if (!isDragged)
            return;

        selectedCells = this.GetSelectedCells()
                                .OfType<GridCellInfo>()
                                .ToList();

        if (selectedCells.Count <= 1)
        {
            Reset();
            return;
        }

        // Get the first selected cell
        var firstCell = selectedCells.First();
        var mappingName = firstCell.Column.MappingName;

        var firstRowData = firstCell.RowData;
        var propertyInfo = firstRowData.GetType().GetProperty(mappingName);

        if (propertyInfo == null)
        {
            Reset();
            return;
        }

        var firstValue = propertyInfo.GetValue(firstRowData);

        // Apply value only to cells in same column
        foreach (var cell in selectedCells)
        {
            if (cell.Column.MappingName != mappingName)
                continue;

            var rowData = cell.RowData;
            var prop = rowData.GetType().GetProperty(mappingName);

            if (prop != null)
            {
                prop.SetValue(rowData, firstValue);
            }
        }

      Reset(); 
    }

    private void Reset()
    {
        isDragged = false;
        selectedCells.Clear();
        this.SelectedCells.Clear();
    }
}