form1.cs

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using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;

namespace ComboxDemo
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void button1_Click(object sender, EventArgs e)
        {
            string youchose = this.comboBox1.SelectedItem.ToString();
            MessageBox.Show(youchose);
        }

        private void comboBox1_SelectedIndexChanged(object sender, EventArgs e)
        {
            string youchose = this.comboBox1.SelectedItem.ToString();
            if (youchose == "S2")
            {
                //添加到combox2
                this.comboBox2.Items.Add("08061B");

            }
            
        }

        private void button2_Click(object sender, EventArgs e)
        {
            //删除
            //this.comboBox1.Items.Remove(this.comboBox1.SelectedItem);
            this.comboBox1.Items.RemoveAt(1);

        }

        private void button3_Click(object sender, EventArgs e)
        {
            this.comboBox1.Items.Insert(1, "S2");
        }
    }
}