"Object reference not set to an instance of an object" problem

[Mergen]

Hi,

I'm trying to use pageview backstage mode in my multi-threading application, but I always get the following error:

"Object reference not set to an instance of an object"

Basically, I create a new thread and in that thread I am trying to make a specific item button and the related page selected. Below is the code:

Dim CurrentTask As Integer = 1

Dim backStageElement As RadPageViewBackstageElement

Private Sub Form1_Load(sender As Object, e As System.EventArgs) Handles Me.Load

Control.CheckForIllegalCrossThreadCalls = False

Dim checkcurrenttaskthread As New Threading.Thread(AddressOf checkcurrenttask)

checkcurrenttaskthread.Start()

End Sub

Public Sub checkcurrenttask()

While True

If CurrentTask = 1 Then

backStageElement =

TryCast(RadPageView1.ViewElement, RadPageViewBackstageElement)

backStageElement.Items(0).IsSelected = True

RadPageView1.SelectedPage = RadPageView1.Pages(0)

End If

End While

End Sub

Is it because I call the pageview control in a thread-unsafe way? How can I get rid of that error?

Thanks in advance!               

[Ivan Todorov]

Hi Mergen,

Please check my reply in the support ticket with the same topic you have opened. If you have any other questions, feel free to ask.

Greetings,
Ivan Todorov
the Telerik team