image/icons in Windows form listBox

I am trying to understand what the issue here is:
The following code works
button1.Image = global::Dnfo.Properties.Resources.RTIimg;

But if trying to add image to listBox, it does not
listBox3.Items.Add(global::DInfo.Properties.Resources.RTimg);
The above command only displays the text "System.Drawing.Bitmap"
do I need to do additional conversation?

many thanks in advanced

clicked post too soon-made some misspells on post
global:AppInfo.Properties.Resources.RTimg; for both

Do a search for "how to add image to listbox in c#". There should be enough links to articles/examples to get you going.

You may try this code to add icon or image to listBox

Code:

---

// GListBoxItem class
public class GlistBoxItem
{
    private string _myText;
    private int _myImageIndex;
    // properties
    public string Text
    {
        get {return _myText;}
        set {_myText = value;}
    }
    public int ImageIndex
    {
      get {return _myImageIndex;}
      set {_myImageIndex = value;}
    }
    //constructor
    public GListBoxItem(string text, int index)
    {
        _myText = text;
        _myImageIndex = index;
    }
    public GListBoxItem(string text): this(text,-1){}
    public GListBoxItem(): this(""){}
    public override string ToString()
    {
        return _myText;
  }
}//End of GListBoxItem class
// GListBox class
public class GListBox : ListBox
{
    private ImageList _myImageList;
    public ImageList ImageList
    {
        get {return _myImageList;}
        set {_myImageList = value;}
    }
    public GlistBox()
  {
        // Set owner draw mode
        this.DrawMode = DrawMode.OwnerDrawFixed;
    }
    protected override void OnDrawItem(System.Windows.Forms.DrawItemEventArgs e)
    {
      e.DrawBackground();
      e.DrawFocusRectangle();
        GListBoxItem item;
        Rectangle bounds = e.Bounds;
        Size imageSize = _myImageList.ImageSize;
        try
        {
            item = (GListBoxItem) Items[e.Index];
            if (item.ImageIndex != -1)
            {
                imageList.Draw(e.Graphics, bounds.Left,bounds.Top,item.ImageIndex);
                e.Graphics.DrawString(item.Text, e.Font, new SolidBrush(e.ForeColor),
                    bounds.Left+imageSize.Width, bounds.Top);
            }
            else
            {
                e.Graphics.DrawString(item.Text, e.Font,new SolidBrush(e.ForeColor),
                    bounds.Left, bounds.Top);
            }
        }
        catch
        {
            if (e.Index != -1)
            {
                e.Graphics.DrawString(Items[e.Index].ToString(),e.Font,
                    new SolidBrush(e.ForeColor) ,bounds.Left, bounds.Top);
            }
            else
            {
                e.Graphics.DrawString(Text,e.Font,new SolidBrush(e.ForeColor),
                    bounds.Left, bounds.Top);
            }
        }
        base.OnDrawItem(e);
    }
}//End of GListBox class

---