Hi Fabio,

Regarding on the problem you met, I think it is due to the MultiSelect mode
ListBox doesn't support direct databinding of the selected values.

I think the proper ways to mark all the selected items is as below:

** add a Label control(you can set it to Visible="False") and bind the
comma separated string (selected items) to the Label

** in the ListBox (or Label)'s PreRender event, you retrieve the string
value from Label.Text and then loop through it to set the certain
ListItem's Selected property. Here is a simple page demonstrate this:

===========aspx============
   <div>
       <asp:Label ID="lblHide" runat="server" Text='<%# GetData()
%>'></asp:Label>
       <asp:ListBox ID="ListBox1" runat="server" SelectionMode="Multiple"
       
           Height="107px" Width="85px" onprerender="ListBox1_PreRender">
           <asp:ListItem Text="Item1" Value="Item1">Item1</asp:ListItem>
           <asp:ListItem Text="Item2" Value="Item2">Item2</asp:ListItem>
           <asp:ListItem Text="Item3" Value="Item3">Item3</asp:ListItem>
           <asp:ListItem Text="Item4" Value="Item4">Item4</asp:ListItem>
           <asp:ListItem Text="Item5" Value="Item5">Item5</asp:ListItem>
       </asp:ListBox>
   </div>

=======code behind===========
   protected void Page_Load(object sender, EventArgs e)
   {
       lblHide.DataBind();
   }

   protected string GetData()
   {
       return "Item1,Item2";
   }

   protected void ListBox1_PreRender(object sender, EventArgs e)
   {
       ListBox lb = (ListBox)sender;
       Label lbl = (Label)lb.NamingContainer.FindControl("lblHide");
       string value = lbl.Text;

       string[] items = value.Split(new char[] { ',' });

       foreach (string item in items)
       {
           lb.Items.FindByValue(item).Selected = true;
       }
     
   }
=============================

Hope this helps.

Sincerely,

Steven Cheng

Microsoft MSDN Online Support Lead



==================================================

Get notification to my posts through email? Please refer to
http://msdn.microsoft.com/subscriptions/managednewsgroups/default.aspx#notif
ications.



Note: The MSDN Managed Newsgroup support offering is for non-urgent issues
where an initial response from the community or a Microsoft Support
Engineer within 1 business day is acceptable. Please note that each follow
up response may take approximately 2 business days as the support
professional working with you may need further investigation to reach the
most efficient resolution. The offering is not appropriate for situations
that require urgent, real-time or phone-based interactions or complex
project analysis and dump analysis issues. Issues of this nature are best
handled working with a dedicated Microsoft Support Engineer by contacting
Microsoft Customer Support Services (CSS) at
http://msdn.microsoft.com/subscriptions/support/default.aspx.

==================================================
   

This posting is provided "AS IS" with no warranties, and confers no rights.

--------------------