ComboBox1 委托，选定的索引后显示信息

/*****************************************************************
* Copyright(C) 2011 比万科技
* 文件名：FrmMain ;
* 中文标识：主窗体 ;
* 文件功能描述：可以为该事件创建事件处理程序，以确定 ComboBox
*                中选定的索引何时更改。这在需要根据 ComboBox 中
*                的当前选定内容显示其他控件中的信息时非常有用。
*                可以使用该事件的事件处理程序来加载其他控件中的
*                信息。
* 创建标识：HT20110404
* 日期：2011-04-04 ，星期一，
* 编者：beeone
*
* 修改标识：
* 修改描述：
*
*****************************************************************/

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

namespace HTWork
{
    public partial class FrmMain : Form
    {
        public FrmMain()
        {
            InitializeComponent();
            InitializesComboBox();
        }

internal System.Windows.Forms.ComboBox ComboBox1;

        private void InitializesComboBox()
        {
            this.ComboBox1 = new System.Windows.Forms.ComboBox();
            string[] employees = new string[]{"张,一", "张,二",
    "王,某", "李,一",
    "赵,一", "张,一", "姜,某",
    "关,某", "隋,某", "孙,一 ",
    "李,一", "张,二",
    "张,二", "郑,一", "张,一",
    "张,二", "郑,一", "孙,一",
    "赵,一", "吴,某", "钱,某",
    "孙,一 "};

            ComboBox1.Items.AddRange(employees);
            this.ComboBox1.Location = new System.Drawing.Point(102, 102);
            this.ComboBox1.MaxDropDownItems = 25;
            this.ComboBox1.DropDownStyle = ComboBoxStyle.DropDownList;
            this.ComboBox1.Name = "ComboBox1";
            this.ComboBox1.Size = new System.Drawing.Size(136, 81);
            this.ComboBox1.TabIndex = 0;
            this.Controls.Add(this.ComboBox1);

            // Associate the event-handling method with the
            // SelectedIndexChanged event.
            this.ComboBox1.SelectedIndexChanged +=
                new System.EventHandler(ComboBox1_SelectedIndexChanged);

}

        private void ComboBox1_SelectedIndexChanged(object sender, EventArgs e)
        {
            ComboBox comboBox = (ComboBox)sender;

            // Save the selected employee's name, because we will remove
            // the employee's name from the list.
            string selectedEmployee = (string)ComboBox1.SelectedItem;

int count = 0;
int resultIndex = -1;

            // Call the FindStringExact method to find the first
            // occurrence in the list.
            resultIndex = ComboBox1.FindStringExact(selectedEmployee);

            // Remove the name as it is found, and increment the found count.
            // Then call the FindStringExact method again, passing in the
            // index of the current found item so the search starts there
            // instead of at the beginning of the list.
            MessageBox.Show(Convert.ToString(resultIndex));
            while (resultIndex != -1)
            {
                ComboBox1.Items.RemoveAt(resultIndex);
                count += 1;
                resultIndex = ComboBox1.FindStringExact(selectedEmployee,
                    resultIndex);
            }
            // Update the text in Textbox1.
            TextBox1.Text = TextBox1.Text + "\r\n" + selectedEmployee + ": "
                + count;

            listBox1.Items.Add (listBox1.Text + "\r\n" + selectedEmployee + ":" + count);
        }
    }
}