Why Experts Exchange?

Experts Exchange always has the answer, or at the least points me in the correct direction! It is like having another employee that is extremely experienced.

Jim Murphy
Programmer at Smart IT Solutions

When asked, what has been your best career decision?

Deciding to stick with EE.

Mohamed Asif
Technical Department Head

Being involved with EE helped me to grow personally and professionally.

Carl Webster
CTP, Sr Infrastructure Consultant
Ask ANY Question

Connect with Certified Experts to gain insight and support on specific technology challenges including:

Professional Opinions
Ask a Question
Did You Know?

We've partnered with two important charities to provide clean water and computer science education to those who need it most. READ MORE

troubleshooting Question

ASP Listbox doesn't show selected Items

Avatar of ktpoitm
ktpoitm asked on
3 Comments1 Solution418 ViewsLast Modified:

i created a listbox and filled it with data from a data table. The Listbox is set to multiselect.
If i now select an item, the selected property does not get set for any item.
What am i missing ?

ASP Site 

<%@ Page Title="" Language="C#" MasterPageFile="~/Site.master" AutoEventWireup="true" CodeFile="QVSLogoff.aspx.cs" Inherits="QVSLogoff" %>

<asp:Content ID="Content1" ContentPlaceHolderID="HeadContent" Runat="Server">
<asp:Content ID="Content2" ContentPlaceHolderID="MainContent" Runat="Server">

    <p class="LogoffTitel">
        Schedule User Logoff
    <table width="100%">
            <col width="33%" />
            <col width="34%" />
            <col width="33%" />
            <td align="center" valign="middle" dir="ltr">
                    Available PC's in Domain</p>
                <asp:ListBox ID="lbxAvailable" runat="server" Height="100%" Rows="20" 
                    SelectionMode="Multiple" Width="100%">
            <td align="center" valign="middle" dir="ltr">
                <br />
                <br />
                <br />
                <asp:Button ID="btnAdd" runat="server" Text=">>" onclick="btnAdd_Click" />
                <br />
                <br />
                <br />
                <br />
                <br />
                <asp:Button ID="btnRemove" runat="server" Text="<<" />
                <br />
                <br />
                <br />
                <br />
            <td align="center" valign="middle" dir="ltr">
                    Selected PC's For Logoff</p>
                <asp:ListBox ID="lbxSelected" runat="server" Height="100%" Rows="20" 
                    SelectionMode="Multiple" Width="100%"></asp:ListBox>


Code Behind:

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Configuration;
using System.Data;
using System.Data.SqlClient;
using System.DirectoryServices;

public partial class QVSLogoff : System.Web.UI.Page

    protected void Page_Load(object sender, EventArgs e)
        DataTable dt = GetComputerByDisplayName();
        lbxAvailable.DataSource = dt.DefaultView;
        lbxAvailable.DataValueField = "Computer";
        lbxAvailable.DataTextField = "Computer";
        DataTable dtselected = GetSelectedComputer();
        lbxSelected.DataSource = dtselected.DefaultView;
        lbxSelected.DataValueField = "ComputerName";
        lbxSelected.DataTextField = "ComputerName";


    protected DataTable GetSelectedComputer()
        dsKTPOIntanetTableAdapters.PCtoLogoffTableAdapter dslogoff = new dsKTPOIntanetTableAdapters.PCtoLogoffTableAdapter();
        dsKTPOIntanet.PCtoLogoffDataTable tbllogoff = new dsKTPOIntanet.PCtoLogoffDataTable();

        tbllogoff.DefaultView.Sort = "ComputerName";
        return tbllogoff;

    protected DataTable GetComputerByDisplayName()
        DirectoryEntry de = new DirectoryEntry(ConfigurationManager.AppSettings.Get("ADPath"));
        de.Username = ConfigurationManager.AppSettings.Get("ADServiceAccount");
        de.AuthenticationType = AuthenticationTypes.Secure;
        de.Password = ConfigurationManager.AppSettings.Get("ADServiceAccountPassword");

        DirectorySearcher directroysearcher = new DirectorySearcher(de);
        directroysearcher.ClientTimeout = TimeSpan.FromSeconds(30);

        directroysearcher.Filter = "(&(objectClass=Computer))";

        SearchResultCollection searchresults;
        searchresults = directroysearcher.FindAll();
        if(searchresults != null)

        DataTable myTable = new DataTable("ActiveDir");
        DataColumn myCol;
        DataRow myRow;
        myCol = new DataColumn("Computer", System.Type.GetType("System.String"));
        myCol.DefaultValue = "";

        foreach (SearchResult result in searchresults)
                myRow = myTable.NewRow();
                myRow["Computer"] = result.Properties["name"][0].ToString(); 
            myTable.DefaultView.Sort = "Computer";
            return myTable;

            return null;

    protected void btnAdd_Click(object sender, EventArgs e)
        dsKTPOIntanetTableAdapters.PCtoLogoffTableAdapter dslogoff = new dsKTPOIntanetTableAdapters.PCtoLogoffTableAdapter();
        dsKTPOIntanet.PCtoLogoffDataTable tbllogoff = new dsKTPOIntanet.PCtoLogoffDataTable();
        dsKTPOIntanet.PCtoLogoffRow rowlogoff;

        string ComputerToAdd = string.Empty;
        foreach (ListItem li in lbxAvailable.Items)
                rowlogoff = tbllogoff.NewPCtoLogoffRow();
                rowlogoff.ComputerName = li.Value;
Avatar of devlab2012
devlab2012Flag of India image

Our community of experts have been thoroughly vetted for their expertise and industry experience.

This problem has been solved!
Unlock 1 Answer and 3 Comments.
See Answers