滚动数据网格视图时强制重绘？

Question

在WinForms表单中，我有一个表布局面板和两个DataGridViews（DGV1和DGV2）。在两个数据网格视图之间绘制线。

private void TableLayoutPanel1_Paint(object sender, PaintEventArgs e)
{
    DrawLines(e.Graphics);
}

private void DrawLines(Graphics g)
{
    var DGV1Rows = GetVisibleDataGridViewRows(DGV1);
    var DGV2Rows = GetVisibleDataGridViewRows(DGV2);
    var lines = GetLines(DGV1Rows, DGV2Rows); // Find all relations between two grid views
    foreach (var line in lines)
    {
        g.DrawLine(line.Pen, line.R1, line.C1, line.R2, line.C2);
    }
}

private IEnumerable<(int R1, int C1, int R2, int C2, Pen Pen)> GetLines(
    IEnumerable<DataGridViewRow> Rows1,
    IEnumerable<DataGridViewRow> Rows2)
{ .... // return the lines between the rows of the two grids. 
       // the line will point to the bottom of the grids if the rows are not visible in another side
}

IEnumerable<DataGridViewRow> GetVisibleRows(DataGridView dgv)
{
    var visibleRowsCount = dgv.DisplayedRowCount(true);
    var firstVisibleRowIndex = dgv.FirstDisplayedCell.RowIndex;
    for (int i = firstVisibleRowIndex; i < firstVisibleRowIndex + visibleRowsCount; i++)
    {
        yield return dgv.Rows[i];
    }
}

在应用程序运行之后绘制了线条。但是，如果滚动网格中的行，这些行不会重绘吗？滚动时如何强制其重画线条？