ASP.NET Populate a dropdownlist based on the changed event in another dropdown

Question

I want to populate the dropdownlist ddVerantwortlich1 with the people with the proper credentials based on the selected process step ddProzessschritt1

It doesn't work if I want to change it using datasource and databind i have to manually loop through the table in the dataset returned from the query. then it works. but not otherwise...

What's the problem? Here my code:

Protected Sub ddProzessschritt1_SelectedIndexChanged(ByVal sender As Object, ByVal e As System.EventArgs) Handles ddProzessschritt1.SelectedIndexChanged
    'StefanSteiger.Debug.MsgBox("index changed!")

    Dim dsProcessResponsibleDataSet As Data.DataSet = New DataSet
    Dim strSQL As String = "SELECT BE_ID, (BE_Name + ' ' +BE_Vorname) as UserName FROM T_Benutzer WHERE BE_ID IN "
    strSQL += "(SELECT BEBG_BE FROM T_Benutzer_Benutzergruppen WHERE BEBG_BG IN "
    strSQL += "(SELECT ZO_BG_ID FROM T_DMS_ZO_Prozesse_Berechtigungen WHERE ZO_PROC_UID = '" + ddProzessschritt1.SelectedValue.ToString + "')) ORDER BY UserName"

    If StefanSteiger.DBcmds.GetDataSet(strSQL, dsProcessResponsibleDataSet) > 0 Then
        Me.ddVerantwortlich1.Items.Clear()
        For Each row As Data.DataRow In dsProcessResponsibleDataSet.Tables(0).Rows
            'StefanSteiger.Debug.MsgBox(row("UserName").ToString + " ¦ " + row("BE_ID").ToString)
            ddVerantwortlich1.Items.Add(New ListItem(row("UserName"), row("BE_ID")))
        Next
        'Me.ddVerantwortlich1.Dispose()
        'Me.ddProzessschritt1.DataSource = dsProcessResponsibleDataSet.Tables(0)
        'Me.ddVerantwortlich1.DataTextField = "UserName"
        'Me.ddVerantwortlich1.DataValueField = "BE_ID"
        'Me.ddVerantwortlich1.DataBind()
    Else
        'Me.ddProzessschritt1.Dispose()
        ddVerantwortlich1.Items.Add(New ListItem("Niemand verantwortlich.", Nothing))
    End If
End Sub

Answer 1

Why you call Dispose on the DropDown? Maybe that's the problem. Give it a try!