3个combox选完后，结果全乱了，还有就是我想3个全选完后，再出结果，各位大神我该怎么改

namespace WindowsFormsApplication1
{
    public partial class Form1 : Form
    {
        private SQLiteConnection m;
        private bool flag;

        public Form1()
        {
            InitializeComponent();
        }

        private void Form1_Load(object sender, EventArgs e)
        {
            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 para1,para2,para3 from 下拉框1", m);
            DataSet ds = new DataSet();
            mAdapter.Fill(ds);
            DataTable dt = ds.Tables[0];
            comboBox1.DataSource = dt;
            comboBox1.ValueMember = "para1";
            comboBox1.DisplayMember = "para1";
            comboBox2.DataSource = dt;
            comboBox2.ValueMember = "para2";
            comboBox2.DisplayMember = "para2";
            comboBox3.DataSource = dt;
            comboBox3.ValueMember = "para3";
            comboBox3.DisplayMember = "para3";
            //comboBox1.SelectedIndex = 0;
            m.Close();
        }

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

        private void comboBox3_SelectedValueChanged(object sender, EventArgs e)
        {
            if (flag == true)//如果按钮被点击
            {
                if (comboBox1.Text == "CHR1" && comboBox2.Text == "1" && comboBox3.Text == "我")
                {

                    //return Creatchart1();
                    textBox1.Text = "1";

                }
                else if (comboBox1.Text == "CHR2" && comboBox2.Text == "1" && comboBox3.Text == "我")
                {
                    textBox2.Text = "2";
                }
                else if (comboBox1.Text == "CHR1" && comboBox2.Text == "2" && comboBox3.Text == "我")
                {
                    textBox3.Text = "3";
                }
                else if (comboBox1.Text == "CHR2" && comboBox2.Text == "2" && comboBox3.Text == "我")
                {
                    textBox4.Text = "4";
                }
                else if (comboBox1.Text == "CHR1" && comboBox2.Text == "1" && comboBox3.Text == "你")
                {

                    //return Creatchart1();
                    textBox5.Text = "5";

                }
                else if (comboBox1.Text == "CHR2" && comboBox2.Text == "1" && comboBox3.Text == "你")
                {
                    textBox6.Text = "6";
                }
                else if (comboBox1.Text == "CHR1" && comboBox2.Text == "2" && comboBox3.Text == "你")
                {
                    textBox7.Text = "7";
                }
                else if (comboBox1.Text == "CHR2" && comboBox2.Text == "2" && comboBox3.Text == "你")
                {
                    textBox8.Text = "8";
                }

            }
        }
    }
}

combox1可选CHR1，CHR2； combox2可选1，2； combox3可选我，你。
一个combox的值单选完CHR2或2或你后，自动选上（CHR2，2，你）；单一个combox的值选完CHR1或1或我后，自动选上（CHR1，1，我）；且3个combox的值仅能选这2种情况（被限定了）。右下角图为3个combox的值。
应该是3个combox的值选（CHR1，1，你）后出现textBox5.Text = "5";然而在3个combox的值选（CHR2，2，你）后出现textBox5.Text = "5";之后再3个combox的值选（CHR2，2，你）后出现textBox8.Text = "8"。
还有就是我想3个全选完后，再出结果，而不是只要combox3变了，就出结果，各位大神我该怎么改

    List<TextBox> tb = new List<TextBox>();
    string[] data = new string[]{"CHR11我","CHR21我",.......省略};

    tb.Add(textBox1);tb.Add(textBox2).......省略(放到Form1_Load)

    private void button29_Click(object sender, EventArgs e)
    {           

        for (int i = 0; i < data.Length; i++)
        {
            if(data[i] == comboBox1.Text +comboBox2.Text + comboBox3.Text)
            {
                tb[i].Text = (i+1).ToString();
            }
        }
    }