private void button5_Click(object sender, EventArgs e) // test добавление чекбоксов по статусами
        {
            string status = pSTATUSDataGridViewTextBoxColumn.ToString();

            foreach (int ttt in status)
            {

            int active = 1;
            int t=System.Convert.ToInt32(ttt); // конвертация из текста в числовой
            
              if ( t < active)
                     { pSTATUSDataGridViewTextBoxColumn.DataGridView.CurrentCell.Value = true;  
                         }  else  {
                                    pSTATUSDataGridViewTextBoxColumn.DataGridView.CurrentCell.Value = false ;  
                                  }
        }
        }

using (OracleConnection conn = new OracleConnection(String.Format("data Source={0};Persist Security Info=True;User ID={1}; password={2}", names, login, pwd))) //строка подключения
                using (OracleCommand cmd = new OracleCommand("Select id, name, status, plicense from ttt.test where status not like '-1' and plicense in(0,1)", conn)) //запрос к таблице
                {
                    conn.Open();
                    using (OracleDataReader reader = cmd.ExecuteReader())
                    {
                        DataTable dataTable = new DataTable();
                        dataTable.Load(reader);
                        dataGridView2.DataSource = dataTable;
                    }

                    
                    conn.Close();
                }

bs.Filter = "[PUSER_ID] LIKE'" + textBox3.Text + "%' AND " + "[PUSER_NAME] LIKE'" + textBox2.Text + "%'"

string query1 = "[PLICENSE_LEVEL] = " + (comboBox1.Text == "Потребитель" ? "1" : "0");
                string query2 = "[PSTATUS] = " + (comboBox2.Text == "Активный" ? "0" : "1");

                bool A = (comboBox1.Text != "");
                bool B = (comboBox2.Text != "");

                string QUERY = "";

                if (A && !B) QUERY = query1;
                if (!A && B) QUERY = query2;
                if (A && B) QUERY = query1 + " AND " + query2;

  bs.Filter = QUERY;

private void button10_Click(object sender, EventArgs e)
        {
            Boolean isEqual = true;
            for (int i = 0; i < dataGridView2.Rows.Count; i++)
                
            {

                if (!dataGridView2.Rows[i].Cells[2].Value.ToString().Equals(dataGridView3.Rows[i].Cells[2].Value.ToString())) 
                {
                    isEqual = false;
                    break;
                }
            }
            MessageBox.Show((isEqual) ? "Равно" : "Неравно");
        }

conn = new OracleConnection(String.Format("data Source={0};Persist Security Info=True;User ID={1}; password={2}", names, login, pwd));
                        conn.Open();

                        int i;
                        for (i = 0; i < this.dataGridView2.Rows.Count; i++)
                        {
                            string sql = string.Format("update TEST.PPOM_USER set pstatus = {0}, plicense_level = {1} where puser_id='{2}'", dataGridView2.Rows[i].Cells[2].Value, dataGridView2.Rows[i].Cells[3].Value, dataGridView2.Rows[i].Cells[0].Value);
                            cmd = new OracleCommand(sql, conn);
                            cmd.ExecuteNonQuery();
                            
                        }
                        conn.Close();

                        for (i = 0; i < this.dataGridView2.Rows.Count; i++)
                        {
                            if (строка i изменилась в процессе работы программы) {
                                ...
                                cmd.ExecuteNonQuery();
                            }
                        }