怎么把y与a，b，c三个变量相关联（每取一次a，b，c的值，y对应取某列）

Question

令a=combox1.text，b=combox2.text,c=combox1.text，下图为三个combox可取的值，怎么把y取那列值与a，b，c三个变量相关联（y=哪该怎么填）

 private void button1_Click(object sender, EventArgs e)
        {
            flag = true;
  }
 private void comboBox1_SelectedValueChanged(object sender, EventArgs e)
        {
            flag1= true;
        }

        private void comboBox2_SelectedValueChanged(object sender, EventArgs e)
        {
            flag2 = true;
        }
 private void Form1_Load(object sender, EventArgs e)
        {
if (flag == true && flag1 == true && flag2 == true)
                {
                    Creatchart1(a，b，c);

                }
        }
 private void Creatchart1(a，b，c)
        {
chart1.Visible = true
            string dbPath = @"D:\历年高考分数.db";
            string sq = @"Data Source=" + dbPath;
            m = new SQLiteConnection(sq);
            m.Open();
            SQLiteDataAdapter mAdapter = new SQLiteDataAdapter("select x,y from 表一 where y=", m);
            DataSet ds = new DataSet();
            mAdapter.Fill(ds);
            DataTable dt = ds.Tables[0];
            //设置图表的数据源
            chart1.DataSource = dt;
            chart1.Series[0].IsVisibleInLegend = false;//是否显示图例
            chart1.Series["Series1"].ChartType = SeriesChartType.Spline;//形状
            chart1.Series[0].XValueMember = "x";//X轴数据成员列
            chart1.Series[0].YValueMembers = "y";//Y轴数据成员列
            m.Close();
                        }

Answer 1

SQLiteDataAdapter mAdapter = new SQLiteDataAdapter("select ('select gzl from 表1 where gzl=('" + s + "')'),yxlc from 表2", m); string s = a + b + c;