就是点击datagrid视图每行前就得到一行的数据，显示在label上。

如果只点击datagrid视图中一行的一个字段，就显示该字段在label上

        private void dataGridView1_CellContentClick(object sender, DataGridViewCellEventArgs e)
        {
            this.label1.Text = this.dataGridView1.SelectedCells[0].Value.ToString();
        }
 
        private void dataGridView1_RowHeaderMouseClick(object sender, DataGridViewCellMouseEventArgs e)
        {
            for (int i = 0; i < this.dataGridView1.SelectedRows[0].Cells.Count; i++)
            {
                this.label1.Text += this.dataGridView1.SelectedRows[0].Cells[i].Value.ToString();
            }
        }