winform 根据dataGridView中的值，来循环使用

for (int i = 0; i < dataGridView.RowCount - 1; i++) //dataGridView.RowCount - 1 来获取列数，-1是因为第一列是标题一般
                    {
                        try
                        {

//这些A、B、C等等，是用来存值，为以后SQL语句填值用，Row是行，Cell是列
                            string A= dataGridView1.Rows[i].Cells[0].Value.ToString();
                            string B = dataGridView1.Rows[i].Cells[1].Value.ToString();
                            string C = dataGridView1.Rows[i].Cells[2].Value.ToString();

//。。。。。。。看你需要多少行
                            SqlConnection sqlConnection = new SqlConnection(constr);
                            sqlConnection.Open();
                            SqlCommand cmd = sqlConnection.CreateCommand();
                            cmd.CommandType = CommandType.Text;
                            cmd.CommandText = "在这里填需要的SQL语句";
                            cmd.ExecuteNonQuery();
                            sqlConnection.Close();
                        }
                        catch (Exception ex)
                        {
                            MessageBox.Show(ex.Message);
                        }