C＃ 36. DataGridView line number

1. Select a row to trigger an event

private System.Windows.Forms.DataGridView dataGridView1;    
private void dataGridView1_RowHeaderMouseClick(object sender, DataGridViewCellMouseEventArgs e)
{
    
	int index = e.RowIndex;	//0,1,2.... 0xffffffff： When empty 
}

2. Get the row number of the cell directly

int index = dataGridView1.CurrentCell.RowIndex;