combox与其他控件的联动，代码不知道哪错了，按完按钮没反应，请各位大神帮忙看看

Question

 public partial class Form1 : Form
    {
        private SQLiteConnection m;

        public object 四川 { get; private set; }
        public object 江苏 { get; private set; }
        public object 直辖市 { get; private set; }
        public object 广州 { get; private set; }
        public bool flag { get; private set; }

        public Form1()
        {
            InitializeComponent();
        }
        private void button1_Click(object sender, EventArgs e)
        {
            flag = true;
        }
        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 province from combox1值", m);
            DataSet ds = new DataSet();
            mAdapter.Fill(ds);
            DataTable dt = ds.Tables[0];
            comboBox1.DataSource = dt;
            comboBox1.ValueMember = "province";
            //comboBox1.SelectedIndex = 0;
            m.Close();
        }

        private void comboBox1_SelectedValueChanged(object sender, EventArgs e)
        {

            if (comboBox1.SelectedItem == 四川)
            {
                if (flag == true)//如果按钮被点击
                {
                    textBox1.Text="我";
                }

            }
            else if (comboBox1.SelectedItem == 江苏)
            {
                if (flag == true)//如果按钮被点击
                {
                    textBox2.Text = "你";
                }
            }
            else if (comboBox1.SelectedItem == 广州)
            {
                if (flag == true)//如果按钮被点击
                {
                    textBox3.Text = "他";
                }
            }
            else if (comboBox1.SelectedItem == 直辖市)
            {
                if (flag == true)//如果按钮被点击
                {
                    Creatchart4();
                }

            }
        }

        private void Creatchart4()
        {
            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 Volume1,Volume2 from 饼形图2", m);
            DataSet ds = new DataSet();
            mAdapter.Fill(ds);
            DataTable dt = ds.Tables[0];
            //设置图表的数据
            chart1.DataSource = dt;
            //chart1.Series.Clear();
            chart1.Series[0].XValueMember = "Volume1";//图例数据成员列
            chart1.Series[0].YValueMembers = "Volume2";//饼形图上数据成员列
            chart1.Series[0].IsValueShownAsLabel = true;//显示标签
            chart1.DataBind();
            m.Close();
        }
                }

Answer 1

    public object 四川 { get; private set; }
    public object 江苏 { get; private set; }
    public object 直辖市 { get; private set; }
    public object 广州 { get; private set; }

这些都去掉

comboBox1.ValueMember = "province";
后面加上
comboBox1.DisplayMember = "province";

if (comboBox1.SelectedItem == 四川)
->
if (comboBox1.Text == "四川")

别的类似

Answer 2

            public object 四川 { get; private set; }
    public object 江苏 { get; private set; }
    public object 直辖市 { get; private set; }
    public object 广州 { get; private set; }
这些变量不是没有赋值吗？变量名可不等于变量的值。

（ comboBox1.SelectedItem == 广州） 这个结果肯定是 false;
    另外VS 的断点调试功能很强大。不会百度一下。