Dim sourcePane As String = CType(sender, ImageButton).Attributes("sourcepane")
Dim targetPane As String = CType(sender, ImageButton).Attributes("targetpane")
Dim sourceBox As ListBox = CType(Page.FindControl(sourcePane), ListBox)
Dim targetBox As ListBox = CType(Page.FindControl(targetPane), ListBox)
end sub
why i can not find my control with the "Page.FindControl" method?
the string name is correcte, the control exist on my page. I still have that error "object reference not set to an instance of..object"
what do i do wrong here !!
thanxYou haven't provided enough information for us to answer your question. Whether Page.FindControl will actually find a control depends on where the control is on your page.
To see what I mean - and hopefully to allow you to solve your own problem - please read:
In Search Of Controls
As an aside, you should always test whether an object has a value before you start working with it.
For example, you should do something like:
' Find the target pane
Dim FoundTargetPane As Control
FoundTargetPane = Page.FindControl( targetPane )' If found, cast the target pane to a ListBox control
Dim targetBox As Listbox
If Not FoundTargetPane Is Nothing Then
targetBox = CType( FoundTargetPane, ListBox )
End If' Work with the targetBox
If Not targetBox Is Nothing Then
' we can work with targetBox, knowing that's we've found it
End If
