ASP.NET Display Selected Items from Listbox in Textbox

Question

I'm trying to display all selected items from a listbox into a textbox. Currently I'm doing the following without success:

For i As Integer = 0 To lb_words.ListCount
    If lb_words.Selected(i) = True Then
        tb_text.Text &= " Presto"
    End If
Next

What should be happening is that for every selected item in my listbox (lb.words) I want it to be appended to my textbox. So say my listbox contains Apple, Orange and Banana and I select Apple and Banana, my textbox text should read "Apple Banana"...

I've just introduced myself to ASP.NET so keep things simple :D Thanks.

Answer 1

Try this:

Dim s as String = ""

For each x as ListItem in lb_words.Items
     if x.Selected Then s &= x.Text & " "
Next

Answer 2

One solution would be to override the .ToString() method to concatenate all the values in your list.

Answer 3

aspx page:

   <asp:ListBox ID="myList" runat="server" SelectionMode="Multiple">
        <asp:ListItem>Apple</asp:ListItem>
        <asp:ListItem>Orange</asp:ListItem>
        <asp:ListItem>Grapes</asp:ListItem>
   </asp:ListBox>
   <br/>
   <asp:TextBox id="myText" runat="server"></asp:TextBox>

codebehind (C#)

 StringBuilder s=new StringBuilder();
        for (int i = 0; i < myList.Items.Count; i++)
            sb.Append(myList.Items[i].Selected ? myList.Items[i].Text + " " : "");
 myText.Text=sb.ToString();

Answer 4

You can use lb_words.SelectedItems instead of looping through all the records and finding the selected items among them. You can use the following code:

        Dim s As New StringBuilder()

        For Each item As Object In Me.lb_words.SelectedItems
            s.Append(item)
            s.Append(" ")
        Next

        Me.TextBox1.Text = s.ToString()

If you select Apple & Banana, your textbox will contain 'Apple Banana '