public partial class Form2 : Form
    {
        public Form2()
        {
            InitializeComponent();
        }

        private void Form2_Load(object sender, EventArgs e)
        {
            List<data> list = new List<data>();
            list.Add(new data() { name="A1",sex="男"  });
            list.Add(new data() { name = "A2", sex = "女" });
            this.bindingSource1.DataSource = list;
            this.comboBox1.DataSource = this.bindingSource1;
            this.comboBox1.DisplayMember = "name";
            this.textBox1.DataBindings.Add("Text", this.bindingSource1, "sex");
        }
    }

    class data
    {
        public string name { get; set; }
        public string sex { get; set; }
    }