Retrieving the chosen value / selected index from a RadioButtonList

[Vahagn]

Hi, how do I retrieve the chosen value from a RadioButtonList? I have a RadioButtonList that is populated dynamically with a "Next" button. Ie, I have a list of questions each with 2-3 answer options. When the "Next" button is pressed, it fetches the next question from the DB and the corresponding set of answers (only one of which is true). Then when the user chooses his answer / radio button from the list, he uses the same "Next" button to submit his selection to the server. That means that the next time the page loads, the question is different and the RadioButtonList gets populated with a new set of answers.

My problem is that the SelectedIndexChanged method of the RaioButtonList is not being executed. How do I capture the user's answer selection?

Protected Sub Next_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles [Next].Click
 
       'this is always false: 
            If list.SelectedIndex > -1 Then
                label.Text = "You chose: " & list.SelectedItem.Text
            End If
 
        If Not Page.IsCallback Then
            If Not Session("count") Is Nothing Then
                count = Session("count")
                situationIds = Session("sit_ids")
                list.AutoPostBack = False
                list.ID = "list"
                AddHandler list.SelectedIndexChanged, AddressOf list_SelectedIndexChanged
            Else : count = 0
            End If
            If count < situationIds.Count Then
                sit_id = situationIds.Item(count)
                count = count + 1
                Session("count") = count
                'get the associated answers
                dataReader = dbu.getAnswersBySituationId(sit_id)
 
                While dataReader.Read
                    Dim id As Integer = dataReader.Item("id") 'works
                    Dim answer As String = dataReader.Item("text") 'works
                    ' Add the items
                    list.Items.Add(New ListItem(answer, answer))
                    'list.Items.Add(New ListItem("Two", "2"))
                End While
 
                list.DataBind()
                holder.Controls.Add(list)
 
            End If
        End If
    End Sub
 
 
    'this method never gets hit:
    Protected Sub list_SelectedIndexChanged(ByVal sender As Object, ByVal e As System.EventArgs) Handles list.SelectedIndexChanged
        Dim l As RadioButtonList = DirectCast(FindControl("list"), RadioButtonList)
        label.Text = l.SelectedItem.Text
    End Sub

Thanks beforehand!
Vahagn

[nateraaaa]

Is your RadioButtonList AutoPostBack property set to true? If not the sequence of your page when you click the Next button will be to hit your page_load event then your next button click event. If you set the RadioButtonList to AutoPostBack = true you should be able to retrieve the selected value.

Let us know if this works.

Nathan

[Vahagn]

Hi Nathan - it is set to TRUE, but it is done separately in Page_Init (Because I moved it there from the "Next_Clicked" method while I was trying to get it to work):

  Protected Sub Page_Init(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Init
        list.AutoPostBack = True
        list.ID = "list"
        AddHandler list.SelectedIndexChanged, AddressOf list_SelectedIndexChanged
        Dim l As RadioButtonList = DirectCast(FindControl("list"), RadioButtonList)
        'label.Text = l.SelectedItem.Text 'this gives a null pointer exception
    End Sub

Is your RadioButtonList AutoPostBack property set to true? If not the sequence of your page when you click the Next button will be to hit your page_load event then your next button click event. If you set the RadioButtonList to AutoPostBack = true you should be able to retrieve the selected value.

Let us know if this works.

Nathan