ListBox多个选择模式不起作用

Question

I have an asp:ListBox that I'm dynamically generating items for. The Selection mode is set to "multiple" but I can only select one item

<asp:ListBox runat="server" ID="lstLanguages" SelectionMode="multiple" Width="200">
</asp:ListBox>

---

var languages = GetSiteLanguages();
foreach (var lang in languages)
{
    lstLanguages.Items.Add(new ListItem(lang.Name));
}
lstLanguages.SelectionMode = ListSelectionMode.Multiple;

I tried setting the selection mode both in the aspx file and in the code behind but it's not working.

Answer 1

You are adding Items in a wrong way in the ListBox. The correct way to add items is:

    var languages = GetSiteLanguages();
    foreach (var lang in languages)
    {
        lstLanguages.Items.Add(lang); //lang should be a string value.
    }

Note: I am supposing that the "languages" is a List of Strings.