How to move gridview selected row up/down on KeyUp or Keydown press

Question

1. The user selects one row
2. there will be up arrow and down arrow.

Answer 1

For me this worked:

 public static void MoveUp(DataGridView dgv)
    {
        if (dgv.RowCount <= 0)
            return;

        if (dgv.SelectedRows.Count <= 0)
            return;

        var index = dgv.SelectedCells[0].OwningRow.Index;

        if (index == 0)
            return;

        var rows = dgv.Rows;
        var prevRow = rows[index - 1];
        rows.Remove(prevRow);
        prevRow.Frozen = false;
        rows.Insert(index, prevRow);
        dgv.ClearSelection();
        dgv.Rows[index - 1].Selected = true;
    }

    public static void MoveDown(DataGridView dgv)
    {
        if (dgv.RowCount <= 0)
            return;

        if (dgv.SelectedRows.Count <= 0)
            return;

        var rowCount = dgv.Rows.Count;
        var index = dgv.SelectedCells[0].OwningRow.Index;

        if (index == rowCount - 1) // Here used 1 instead of 2
            return;

        var rows = dgv.Rows;
        var nextRow = rows[index + 1];
        rows.Remove(nextRow);
        nextRow.Frozen = false;
        rows.Insert(index, nextRow);
        dgv.ClearSelection();
        dgv.Rows[index + 1].Selected = true;
    }

The difference to Mario's code is that I used (rowCount - 1) instead of (rowCount - 2) ... After changing this, it worked perfectly. Before the move-down didn't work if you only have 2 rows in your DataGridView...