下拉列表框

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

namespace 下拉列表框
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void comboBox1_SelectedIndexChanged(object sender, EventArgs e)
        {
            switch (comboBox1.SelectedIndex)
            {
                case 0: label1.ForeColor = Color.Red; break;
                case 1: label1.ForeColor = Color.Green; break;
                case 2: label1.ForeColor = Color.Black; break;
            }
        }
    }
}