3个combox选完后，出图顺序不对，还有就是我想3个全选完后，再出图，各位大神我该怎么改

Question

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")
                {

                 Creatchart1();

                }
                else if (comboBox1.Text == "CHR2" && comboBox2.Text == "1" && comboBox3.Text == "我")
                {
                     Creatchart2();
                }
                else if (comboBox1.Text == "CHR1" && comboBox2.Text == "2" && comboBox3.Text == "我")
                {
                     Creatchart3();
                }
                else if (comboBox1.Text == "CHR2" && comboBox2.Text == "2" && comboBox3.Text == "我")
                {
                     Creatchart4();
                }
                else if (comboBox1.Text == "CHR1" && comboBox2.Text == "1" && comboBox3.Text == "你")
                {

                    Creatchart5();

                }
                else if (comboBox1.Text == "CHR2" && comboBox2.Text == "1" && comboBox3.Text == "你")
                {
                     Creatchart6();
                }
                else if (comboBox1.Text == "CHR1" && comboBox2.Text == "2" && comboBox3.Text == "你")
                {
                    Creatchart7();
                }
                else if (comboBox1.Text == "CHR2" && comboBox2.Text == "2" && comboBox3.Text == "你")
                {
                    Creatchart8();
                }

            }
        }
    }
}

说明：combox1可选CHR1，CHR2； combox2可选1，2； combox3可选我，你（combox的值是由连接sqlite数据库得到的
值。每个 Creatchartx()代表出一个图（柱形图或饼形图或曲线图），之间没有规律。

错误1：一个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种组合。

错误2：应该是3个combox的值选（CHR1，1，你）后出现 Creatchart5();然而在3个combox的值选（CHR2，2，你）后出现t Creatchart8();之后再3个combox的值选（CHR2，2，你）后出现 Creatchart8()。

想要实现效果：3个combox值应能选8种组合。我想3个全选完后，再出图，而不是点完按钮后只要combox3变了，就出图；各位大神我该怎么改

Answer 1

那你为啥不把这些判断写在按钮单击事件里呢？选完值后点下按钮就出一个图