c#中combox赋值

class item

{

public string Txt { get; set; }

public string value { get; set; }

public override string ToString()

{

return Txt;

}

}

public partial class Form1 : Form

{

public Form1()

{

InitializeComponent();

}

private void Form1_Load(object sender, EventArgs e)

{

item school = new item() {Txt="学校",value="0" };

item student = new item() { Txt = "学生", value = "1" };

item score = new item() { Txt = "成绩", value = "2" };

comboBox1.Items.Add(school);

comboBox1.Items.Add(student);

comboBox1.Items.Add(score);

}

private void button2_Click(object sender, EventArgs e)

{

MessageBox.Show((this.comboBox1.SelectedItem as item).value);

}

}