Selection of items in list box

[maliksleo]

i have a list box now i want to select 3 values in it through VB code

and restrict the user to select onle three values please help me

Regards

[bhupinder]

Try code

 <asp:listbox id="list1" runat="server" selectionmode="multiple">
 
      <asp:listitem>Madrid</asp:listitem>
 
      <asp:listitem>Oslo</asp:listitem>
 
      <asp:listitem>Lisbon</asp:listitem>
 
    </asp:listbox>

VB Code

Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As_
System.EventArgs) Handles Button1.Click
    Dim i As Integer
    TextBox1.Text = "You Selected" & " "
    For i = 0 To ListBox1.Items.Count - 1
        If ListBox1.Items(i).Selected Then
            TextBox1.Text = TextBox1.Text & ListBox1.Items(i).Text & " "
        End If
    Next
End Sub

[Frinavale]

Could you please elaborate on what you mean when you say:
@maliksleo
Do you only want 3 values to appear in the ListBox?
How are you adding items to your ListBox?

-Frinny

[tlhintoq]

I think he's saying he has a listbox with multiple selection, of many items. But wants to restrict it to no more than 3.

Maliksleo: If that sounds right use the SelectedIndicesChanged event, and compare to the number of items already selected.

[maliksleo]

thanks for your consideration

tlhintoq is right i want to restrict the user to select not more than three values

but how can i compare the mentioned items?

[Frinavale]

You need to implement a method that handles the ListBox's SelectedIndexChanged event. Do your comparison in this method.

[maliksleo]

i got the point thanks alot for your help
thanks
maliksleo

[maliksleo]

now one more thing how i can select different values in listbox through vb code?

values are coming from database like

china,USA,UK etc

now how i can show these values selected in list box?

Thanks in advance

[maliksleo]

Dim lang As Array, i
        lang = Split(language, ",")
        Response.Write(lang(1))
        For Each i In lang
            Dim j As Integer
            For j = 0 To lblangknown.Items.Count - 1
                If i = lblangknown.Items(j).Text Then
                    lblangknown.Items(j).Selected = True
                End If
            Next
        Next

i have problem with this code i m not getting any selected value plz help

[maliksleo]

i found the solution below

lblangknown.DataBind()
        Dim lang As Array, i
        lang = Split(language, ",")
        For Each i In lang

only u need to bind your data first and then execute the code which i previously posted

thanks
maliksleo

[NitinSawant]

instead of sending the values to server and then manipulating it, you should use client side javascript.