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8.4

Use Listbox.SelectedItem in an asp.net web page

Asked by sebastiz in Programming for ASP.NET, Microsoft Visual Basic.Net, Visual Studio

Tags: listbox, item, selected

I have a web page. on  On it is a dynamically filled listbox (called ListFavoriteURLs). I would like a user to be able to select an item and then press a button (called Remove)to remove that item from the users profile. The problem is that the page does not seem to recognise that an item has been selected, and therefore I get a null exception reference returned. The code is below. There are two event handlers- the Page_load event handler (not shown) and the remove_Click handler which deals with deleting the selected Item from the list. The listbox properties are set to autoPostBack=False and ViewState=True
Any ideas?
Protected Sub Remove_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles Remove.Click

        Dim i As Integer
        If listFavoriteURLs.SelectedItem Is Nothing Then MsgBox("No items selected!")
        If listFavoriteURLs.SelectedItem Is Nothing Then MsgBox("No value selected!")

        For i = 0 To Profile.FavoriteURLs.Count - 1
            If String.Compare(Profile.FavoriteURLs.Item(i).Trim(), listFavoriteURLs.SelectedItem.ToString.Trim, True) = 0 Then
                Profile.FavoriteURLs.RemoveAt(i)
            End If
        Next
       
    End Sub

PS when I run this both the message boxes come up!

Seb
[+][-]12/24/07 02:42 PM, ID: 20526002Accepted Solution

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About this solution

Zones: Programming for ASP.NET, Microsoft Visual Basic.Net, Visual Studio
Tags: listbox, item, selected
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Solution Provided By: jpaulino
Participating Experts: 2
Solution Grade: A
 
[+][-]12/24/07 08:07 AM, ID: 20525063Expert Comment

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