C#我设置好右键菜单以后怎么样获取右键点击的是哪一单元格

我设置好右键菜单以后,怎么样获取右键点击的是哪一单元格 Point p = new Point(contextMenuStrip1.Left, contextMenuStrip1.Top); for (int r = 0; r < dataGridView1.RowCount; r++) { for (int c = 0; c < dataGridView1.Columns.Count; c++) { Rectangle