[Solved] Virtual Scrolling Problems

[Adrian Porger]

Hey folks, I am trying to use the virtual scrolling feature but when I scroll down always a null reference exception at the server is raised.. however when I use the pager symbols and go to second page, or sort the grid by clicking on a column header the error is not longer raised and virtual scrolling works as expected.

my setup is a bit more complex as I use the grid control in an ASP.net UserControl which stores the data in a session variable like this.

Public Property ViewSource() As System.Data.DataView

Get

If m_ViewSource Is Nothing Then
m_ViewSource = CType(Session(Me.UniqueID), Data.DataView)

End If

Return Me.m_ViewSource

End Get

Set(ByVal Value As System.Data.DataView)

Session.Add(Me.UniqueID, Value)

m_ViewSource = Value

End Set

End Property

Private Sub RadGrid1_NeedDataSource(ByVal source As Object, ByVal e As Telerik.Web.UI.GridNeedDataSourceEventArgs) Handles RadGrid1.NeedDataSource

Me.RadGrid1.DataSource = Me.ViewSource

End Sub

The grid is populated like this:

Public Sub LoadView(ByVal viewtable As DataTable)

Try

Dim view As New Data.DataView

 view.Table = viewtable

Me.ViewSource = view

Me.RadGrid1.DataSource = Me.ViewSource

Me.RadGrid1.Rebind()

Catch ex As Exception

RaiseEvent ErrorEvent(Me, New ErrorEventArgs(ex))

End Try

End Sub

Any help would be highly appreciated

[Yavor]

Hello Adrian,

Based on the information supplied thus far I suspect that the issue is related either with the databinding of the control, or with the way the user control is loaded. However, in order to properly assist you, I would suggest that you open a formal support ticket and send us a small working project, incorporating your logic, and showing the problematic behavior. We will review it locally, and advise you further.

Regards,
Yavor
the Telerik team

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