Make ListBox items have a different value than item text

Question

I want a ListBox full of items. Although, each item should have a different value. So when the user selects an item and presses a button, a method will be calle

Answer 1

You can choose what do display using the DisplayMember of the ListBox.

List data = new List();
data.Add(new SomeData() { Value = 1, Text= "Some Text"});
data.Add(new SomeData() { Value = 2, Text = "Some Other Text"});
listBox1.DisplayMember = "Text";
listBox1.DataSource = data;

When the user selects an item, you can read the value (or any other property) from the selected object:

int value = (listBox1.SelectedItem as SomeData).Value;

Update: note that DisplayMember works only with properties, not with fields, so you need to alter your class a bit:

public class SomeData
{
    public string Value { get; set; };
    public string Text { get; set; };
}