How to get multiple values from ASP.NET Listbox

Question

I have the following listbox on aspx page.

  <asp:ListBox runat="server" ID="lbA" Visible="true" 
                SelectionMode="Multiple" DataTextField="A_FACTOR" 
                DataValueField="A_ID" Width="218px"> </asp:ListBox>

then on code behind I have the following on a button click I have the following.

string aFactor = "";

 foreach(ListItem listItem in lbA.Items)
    {
        if (listItem.Selected)
        {
            aFactor += listItem.Value + ",";
        }
    }

when I select values (any values) from the listbox, the listItem.Selected is always false and I am not able to get values because of that. Any idea what is wrong?

Adel - lbA is a listbox control that is bound to database. does it make sense? or am I missing something. thank you. — kalls, Jan 12 '12 at 16:02
You are probably intializing lbA incorrectly, because your code is correct — Adel Boutros, Jan 12 '12 at 16:03
possible duplicate of [Getting all selected values from an ASP ListBox](http://stackoverflow.com/questions/1586078/getting-all-selected-values-from-an-asp-listbox) — Alex Angas, Jul 02 '13 at 04:35

score 0 · Answer 1 · edited Oct 23 '13 at 09:43

0

populate the list in

if (!IsPostBack)
{
}

at the time of form load

edited Oct 23 '13 at 09:43

kleopatra

51,061
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answered Oct 23 '13 at 09:26

GM Arefeen

1

score 0 · Accepted Answer · edited May 23 '17 at 11:48

0

As I thought, you were doing something wrong outside the code you have provided, please see the answer of this link :

Selected item in list box is null

edited May 23 '17 at 11:48

Community

1
1

answered Jan 12 '12 at 16:06

Adel Boutros

10,205
7
55
89

I had outside !Page.IsPostBack. :( I was over confident with my code. I learnt my lesson. – kalls Jan 12 '12 at 16:12

How to get multiple values from ASP.NET Listbox

2 Answers2