selectedindexchanged

[mkiger]

Hey guys,
When I use the selectedindexchanged event of a listbox web control I would
like to be able to to reference the previously selected item. Is there a way
to do that?

 

[Phillip Williams]

Private Sub ListBox1_SelectedIndexChanged(ByVal sender As System.Object,
ByVal e As System.EventArgs) Handles ListBox1.SelectedIndexChanged
Dim prevSelectedIndex As Integer = 0
'check if the ViewState("prevSelectedIndex") exists
If ViewState("prevSelectedIndex") Is Nothing Then prevSelectedIndex
= CType(ViewState("prevSelectedIndex"), Integer)
'do here the processing of your listbox_SelectedIndexChanged event
'...
'Save the selected index in the ViewState
ViewState("prevSelectedIndex") = CType(sender, ListBox).SelectedIndex

End Sub

 

[Phillip Williams]

A correction for the condition; it should read like this:
If Not ViewState("prevSelectedIndex") Is Nothing Then prevSelectedIndex
= CType(ViewState("prevSelectedIndex"), Integer)

 

[mkiger]

Thank you very much! The only thing that bothers me is why I didn't think of
this.