private void button2_Click(object sender, EventArgs e)
        {
            DataTable dt = new DataTable();
            dt.Columns.Add("性别");
            dt.Columns.Add("1/0");
            DataRow dr = dt.NewRow();
            dr["性别"] = "男";
            dr["1/0"] = "1";
            dt.Rows.Add(dr);
            comboBox1.DataSource = dt;
            comboBox1.DisplayMember="性别";
            comboBox1.ValueMember= "1/0";
            comboBox1.SelectedIndexChanged += new EventHandler(comboBox1_SelectedIndexChanged);
        }

        void comboBox1_SelectedIndexChanged(object sender, EventArgs e)
        {
            //throw new Exception("The method or operation is not implemented.");
            MessageBox.Show(this.comboBox1.SelectedValue.ToString());
        }

------解决方案--------------------
尽管 ComboBox 通常用于显示文本项，您仍可向 ComboBox 添加任何对象。 

C# code
using System;
using System.Windows.Forms;

class Form1 : Form
{
  Form1()
  {
    ComboBox combobox1 = new ComboBox();
    combobox1.Parent   = this;
    combobox1.Items.Add(new Sex(1));   // 值为1，显示为 "男"
    combobox1.Items.Add(new Sex(0));   // 值为0，显示为 "女"
  }
  
  static void Main()
  {
    Application.Run(new Form1());
  }
}

struct Sex
{
  public int sex;
  
  public Sex(int sex)
  {
    this.sex = sex;
  }
  
  public override string ToString()
  {
    return sex == 0 ? "女" : "男";
  }
}

------解决方案--------------------
1、定义一个类
VB.NET code

Public Class cboTextValueItem
    Private _text As String
    Private _value As Integer

    Public Sub New(ByVal text As String, ByVal value As Integer)
        _text = text
        _value = value
    End Sub

    Public Property Text() As String
        Get
            Return _text
        End Get
        Set(ByVal value As String)
            _text = value
        End Set
    End Property

    Public Property Value() As Integer
        Get
            Return _value
        End Get
        Set(ByVal value As Integer)
            _value = value
        End Set
    End Property

    [color=#FF0000]
        '重要
        Public Overrides Function ToString() As String
        Return _text
    End Function[/color]
End Class

------解决方案--------------------
C# code
           
comboBox1.Items.Insert(0, new ComboBoxItem("0","请选择"));
comboBox1.Items.Insert(1, new ComboBoxItem("1","根目录"));

  internal class ComboBoxItem:Object
        {
            private string value;
            private string text;
            public ComboBoxItem(string _value, string _text)
            {
                value = _value;
                text = _text;
            }

            public string Text
            {
                get { return text; }
            }

            public string Value
            {
                get { return value; }
            }

            public override string ToString()
            {
                return text;
            }

        }

------解决方案--------------------
C# code
using System;
using System.Windows.Forms;

class Form1 : Form
{
  Form1()
  {
    ComboBox combobox1 = new ComboBox();
    combobox1.Parent   = this;
    combobox1.Items.Add(new Sex(1));   // 值为1，显示为 "男"
    combobox1.Items.Add(new Sex