Databind Selected value for ListBox

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Hello,

I am wondering if there is a method to databind the "Selected" property in a ListBox similar to the way that you can Databind the DisplayMember or ValueMember.

I have a List<myobject> where MyObject contains an ID (valuemember), Name (displaymember) and Active boolean flag (selected?) and I would like an easy way to map it so that the Listbox will understand when the Active flag is changed from one value to the other.

I have looked around the web and yet to find something so I somewhat doubt it is possible but just in case... or if anyone has alternate solutions it would be greatly appreciated.

== EDIT ===

The object I am trying to databind is not a database table but a List of objects (although I presume the idea is basically the same). The object is very simple like the following (I am using .NET 2 so I don't have default get and set):

<br />
public class MyObject<br />
{<br />
  private int id;<br />
  public int ID { get { return id; } set { id = value; } }<br />
<br />
  private string name;<br />
  public string Name { get { return name; } set { name = value; } }<br />
<br />
  private bool flag;<br />
  public bool Flag { get { return flag; } set { flag= value; } }<br />
}<br />
<br />
List<MyObject> myObjectList = new List<MyObject>();<br />
<br />

Sunasara, your assumption is correct: I want the ListBox to show the item as selected if Flag == true and unselected if Flag == false.

Posted 11-Dec-09 5:32am

Maikeru2000

Updated 14-Dec-09 8:20am

v3

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2 solutions

Solution 1

Hi,
Maikeru2000

I got your problem and there is no methods to bind ListBox with multiselect options; i assumed you have a datatable which contains three column like Id,Name or Flag. You have to bind somthing like?

my assumption is:
if Flag contain true it will select an item else unselect.

please let me know your comments, if my assumption is correct, so i'll give you a solution :)

Thanks & Regards
Imdadhusen

Posted 13-Dec-09 23:45pm

Sunasara Imdadhusen

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Sunasara Imdadhusen · Accepted Answer · 2009-12-14T18:18:00

<br />
//This is the class<br />
public class MyObject<br />
{<br />
    private int id;<br />
    public int ID { get { return id; } set { id = value; } }<br />
<br />
    private string name;<br />
    public string Name { get { return name; } set { name = value; } }<br />
<br />
    private bool flag;<br />
    public bool Flag { get { return flag; } set { flag = value; } }<br />
<br />
    public MyObject(int id, string name, bool flag)<br />
    {<br />
        ID = id;<br />
        Name = name;<br />
        Flag = flag;<br />
    }<br />
}<br />
<br />
//Using above class<br />
public partial class Demo : System.Web.UI.Page<br />
{<br />
    protected void Page_Load(object sender, EventArgs e)<br />
    {<br />
        List<MyObject> myObjectList = new List<MyObject>();<br />
        myObjectList.Add(new MyObject(1, "Imdadhusen", true));<br />
        myObjectList.Add(new MyObject(2, "Sunasara", false));<br />
        myObjectList.Add(new MyObject(1, "ASP.Net", true));<br />
        myObjectList.Add(new MyObject(1, "C#", true));<br />
        myObjectList.Add(new MyObject(1, "Java", false));<br />
        myObjectList.Add(new MyObject(1, "JSP", false));<br />
        myObjectList.Add(new MyObject(1, "JavaScript", true));<br />
<br />
        bindListBox(myObjectList, ListBox1);<br />
    }<br />
<br />
    //Bind Listbox with object<br />
    //Note: please make sure your listbox SelectionMode property should be Multiple<br />
    public void bindListBox(List<MyObject> objList, ListBox lst)<br />
    {<br />
        if (objList != null)<br />
        {<br />
            for (int i = 0; i < objList.Count; i++)<br />
            {<br />
                ListBox1.Items.Add(new ListItem(objList[i].Name, objList[i].ID.ToString()));<br />
                if (lst.SelectionMode != ListSelectionMode.Single) ListBox1.Items[i].Selected = objList[i].Flag;<br />
            }<br />
        }<br />
    }<br />
<br />
}<br />