private class Person
        {
            public int Id { get; set; }
            public string Name { get; set; }
        }

        private void 測試控件事件_Load(object sender, EventArgs e)
        {            
            List<Person> list = new List<Person>();
            list.Add(new Person() { Id = 1, Name = "張三" });
            list.Add(new Person() { Id = 2, Name = "李四" });

            List<Person> list2 = new List<Person>();
            list2.Add(new Person() { Id = 1, Name = "張三" });
            list2.Add(new Person() { Id = 2, Name = "李四" });
            list2.Add(new Person() { Id = 3, Name = "王五" });

            comboBox1.DropDownStyle = ComboBoxStyle.DropDownList;
            comboBox1.DisplayMember = nameof(Person.Name);
            comboBox1.ValueMember = nameof(Person.Id);
            comboBox1.DataSource = list;
            comboBox1.SelectedValue = 2;

            dataGridView1.AutoGenerateColumns = false;
            dataGridView1.Columns[0].DataPropertyName = nameof(Person.Id);
            dataGridView1.Columns[1].DataPropertyName = nameof(Person.Name);
            dataGridView1.DataSource = list2;
            dataGridView1.CurrentCell = dataGridView1.Rows[0].Cells[0];

            WriteLog("=========== 初始化結(jié)束 ============");
        }

        private void WriteLog(string text)
        {
            textBox1.AppendText(text + Environment.NewLine);
            textBox1.ScrollToCaret();
        }

        private void ComboBox1_SelectedIndexChanged(object sender, EventArgs e)
        {
            WriteLog($"ComboBox1_SelectedIndexChanged {comboBox1.SelectedIndex}");
        }

        private void ComboBox1_SelectedValueChanged(object sender, EventArgs e)
        {
            WriteLog($"ComboBox1_SelectedValueChanged {comboBox1.SelectedIndex}");
        }

        private void ComboBox1_SelectionChangeCommitted(object sender, EventArgs e)
        {
            WriteLog($"ComboBox1_SelectionChangeCommitted {comboBox1.SelectedIndex}");
        }

        private void DataGridView1_RowEnter(object sender, DataGridViewCellEventArgs e)
        {
            WriteLog($"DataGridView1_RowEnter {e.RowIndex}");
        }

        private void DataGridView1_SelectionChanged(object sender, EventArgs e)
        {
            WriteLog($"DataGridView1_SelectionChanged {dataGridView1.CurrentRow.Index}");
        }