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转自：留下点什么为好
一个最简单方法：） 不过大数据量时候闪啊闪。

      private void dataGridView1_Scroll(object sender, ScrollEventArgs e)
        {
            dataGridView2.FirstDisplayedScrollingRowIndex = dataGridView1.FirstDisplayedScrollingRowIndex;
            dataGridView2.HorizontalScrollingOffset = dataGridView1.HorizontalScrollingOffset;
        }private void dataGridView2_Scroll(object sender, ScrollEventArgs e)
        {
            dataGridView1.FirstDisplayedScrollingRowIndex = dataGridView2.FirstDisplayedScrollingRowIndex;
            dataGridView1.HorizontalScrollingOffset = dataGridView2.HorizontalScrollingOffset;
        }