C#-Datagridview Sortierung, Selektion und Scrollbarposition speichern

 DataGridViewColumn oldColumn = new DataGridViewColumn();
                    SortOrder sortOrder = new SortOrder();
                    List<int> selectedItems = new List<int>();
                    int saveRow = 0;

 //Aktuelle Sortierung zwischenspeichern
                        oldColumn = dataGridView.SortedColumn;
                        sortOrder = dataGridView.SortOrder;

                        if (dataGridView.SelectedRows.Count > 0)
                        {
                            foreach (DataGridViewRow row in dataGridView.SelectedRows)
                            {
                                selectedItems.Add(row.Index);
                            }
                        }
                        //Aktuelle erste angezeigte Zeile speichern
                        if (dataGridView.Rows.Count > 0)
                        {
                            if ((dataGridView.FirstDisplayedCell != null))
                            {
                                saveRow = dataGridView.FirstDisplayedCell.RowIndex;
                            }
                        }

//Your Code

//Sortierung anwenden
                        if ((oldColumn != null))
                        {
                            switch (sortOrder)
                            {
                                case SortOrder.None:
                                    break;
                                case SortOrder.Ascending:
                                    dataGridView.Sort(oldColumn, ListSortDirection.Ascending);
                                    break;
                                case SortOrder.Descending:
                                    dataGridView.Sort(oldColumn, ListSortDirection.Descending);
                                    break;
                            }
                        }
                        else
                        {
                            dataGridView.Sort(dataGridView.Columns[4], ListSortDirection.Ascending);
                        }
                        //Alle SelectedRows resetten
                        foreach (DataGridViewRow row in dataGridView.SelectedRows)
                        {
                            row.Selected = false;
                        }
                        //SelectedRows wieder setzen
                        if (selectedItems.Count > 0)
                        {
                            foreach (int item in selectedItems)
                            {
                                if (dataGridView.Rows.Count > 0)
                                {
                                    if (dataGridView.Rows.Count - 1 >= item)
                                    {
                                        dataGridView.Rows[item].Selected = true;
                                    }
                                }
                            }
                        }
                        //Scrollbar wieder richtig setzen
                        if (saveRow != 0 & saveRow < dataGridView.Rows.Count)
                        {
                            dataGridView.FirstDisplayedScrollingRowIndex = saveRow;
                        }