如何在sql语句中使s、wax从列中分别读取前后两部分

Question

string wax = comboBox1.Text + comboBox2.Text + comboBox3.Text;string s=comboBox1.Text+comboBox2.Text+comboBox3.Text;
SQLiteDataAdapter mAdapter = new SQLiteDataAdapter("select " + wax + ",para," + s + " from 电缆参数,电缆参数1", m);             
chart2.Series[0].YValueMembers = wax;chart2.Series[1].YValueMembers = s;

两组数（wax，s）都需要根据下拉框的值来选择列，启动时显示ambiguous column name: CHR111009（comboBox1.Text=CHR1，comboBox2.Text=1，c
omboBox3.Text=1009）
可不可以让wax，s分别是同一列的前20个数，后20个数 如果不行，应该怎么改

Answer 1

string wax = "";
for (int i = 1; i <= 20; i++)
wax += (this.Controls["comboBox" + i.ToString()] as ComboBox),Text;