BackGroundWorker.ProgressChanged "Cross-thread operation not valid" at 2nd/3th/... progress

Hi,

I'm having some weird problem using the BackGroundWorker in an Outlook
(2003) Add-In, with VB.NET 2005:
I'm using the BackGroundWorker to get the info of some mailitems, and after
each item I want to raise the ProgressChanged-event to update the
DataGridView.
It works fine when only one Progresschanged is fired, but at the second,
third, fopurth etc it raises everytile a 'Cross-thread operation not
valid"-exception on lmy DataGridView (dgvAdd).

Any idea what causes this problem? What am I doing wrong? What is the
problem here?

Any help our hints would be really appreciated!

Thanks a lot in advance,

Pieter


This is my code:
Me.bgwInfoOutlook.RunWorkerAsync(Me.m_colItems)

Private Sub bgwInfoOutlook_DoWork(ByVal sender As Object, ByVal e As
System.ComponentModel.DoWorkEventArgs) Handles bgwInfoOutlook.DoWork
Dim col As Collection = e.Argument
AddHandler docCtrl.InfoListChanged, AddressOf InfoListChanged
Dim str As String = docCtrl.GetOutlookInfo(col,
Me.m_objOutlookFolder)
e.Result = docCtrl.AddedDocMails
End Sub

Private Sub InfoListChanged(ByVal sender As Object, ByVal e As
EventArgs)
Me.bgwInfoOutlook.ReportProgress(0)
End Sub

Private Sub bgwInfoOutlook_ProgressChanged(ByVal sender As Object, ByVal
e As System.ComponentModel.ProgressChangedEventArgs) Handles
bgwInfoOutlook.ProgressChanged
'bind the list to the datagridview
Try
Me.dgvAdd.DataSource = Nothing
Me.dgvAdd.DataSource = docCtrl.InfoList
Catch ex As Exception
ErrorMessage(ex)
End Try
End Sub


This is the exception:

{"Cross-thread operation not valid: Control 'dgvAdd' accessed from a thread
other than the thread it was created on."}
System.InvalidOperationException: {"Cross-thread operation not valid:
Control 'dgvAdd' accessed from a thread other than the thread it was created
on."}
Data: {System.Collections.ListDictionaryInternal}
HelpLink: Nothing
InnerException: Nothing
Message: "Cross-thread operation not valid: Control 'dgvAdd' accessed
from a thread other than the thread it was created on."
Source: "System.Windows.Forms"
StackTrace: " at System.Windows.Forms.Control.get_Handle()
at System.Windows.Forms.Control.get_InternalHandle()
at System.Windows.Forms.Control.get_CreateParams()
at System.Windows.Forms.ScrollBar.get_CreateParams()
at System.Windows.Forms.VScrollBar.get_CreateParams()
at System.Windows.Forms.Control.UpdateBounds(Int32 x, Int32 y, Int32
width, Int32 height)
at System.Windows.Forms.Control.SetBoundsCore(Int32 x, Int32 y, Int32
width, Int32 height, BoundsSpecified specified)
at System.Windows.Forms.Control.SetBounds(Int32 x, Int32 y, Int32 width,
Int32 height, BoundsSpecified specified)
at System.Windows.Forms.Control.set_Bounds(Rectangle value)
at System.Windows.Forms.DataGridView.LayoutScrollBars ()
at System.Windows.Forms.DataGridView.ComputeLayout()
at System.Windows.Forms.DataGridView.PerformLayoutPri vate(Boolean
useRowShortcut, Boolean computeVisibleRows, Boolean
invalidInAdjustFillingColumns, Boolean repositionEditingControl)
at
System.Windows.Forms.DataGridView.OnColumnWidthCha nged(DataGridViewColumnEventArgs
e)
at
System.Windows.Forms.DataGridView.OnBandThicknessC hanged(DataGridViewBand
dataGridViewBand)
at System.Windows.Forms.DataGridViewBand.set_Thicknes sInternal(Int32
value)
at System.Windows.Forms.DataGridView.AdjustFillingCol umns()
at System.Windows.Forms.DataGridView.ComputeLayout()
at System.Windows.Forms.DataGridView.PerformLayoutPri vate(Boolean
useRowShortcut, Boolean computeVisibleRows, Boolean
invalidInAdjustFillingColumns, Boolean repositionEditingControl)
at System.Windows.Forms.DataGridView.ResetUIState(Boo lean useRowShortcut,
Boolean computeVisibleRows)
at
System.Windows.Forms.DataGridViewRowCollection.OnC ollectionChanged_PreNotification(CollectionChangeA ction
cca, Int32 rowIndex, Int32 rowCount, DataGridViewRow& dataGridViewRow,
Boolean changeIsInsertion)
at
System.Windows.Forms.DataGridViewRowCollection.OnC ollectionChanged(CollectionChangeEventArgs
e, Int32 rowIndex, Int32 rowCount, Boolean changeIsDeletion, Boolean
changeIsInsertion, Boolean recreateNewRow, Point newCurrentCell)
at System.Windows.Forms.DataGridViewRowCollection.Ins ertInternal(Int32
rowIndex, DataGridViewRow dataGridViewRow, Boolean force)
at
System.Windows.Forms.DataGridView.DataGridViewData Connection.ProcessListChanged(ListChangedEventArgs
e)
at
System.Windows.Forms.DataGridView.DataGridViewData Connection.currencyManager_ListChanged(Object
sender, ListChangedEventArgs e)
at
System.Windows.Forms.CurrencyManager.OnListChanged (ListChangedEventArgs e)
at System.Windows.Forms.CurrencyManager.List_ListChan ged(Object sender,
ListChangedEventArgs e)
at System.ComponentModel.BindingList`1.OnListChanged( ListChangedEventArgs
e)
at System.ComponentModel.BindingList`1.FireListChange d(ListChangedType
type, Int32 index)
at System.ComponentModel.BindingList`1.InsertItem(Int 32 index, T item)
at System.Collections.ObjectModel.Collection`1.Add(T item)
at BaseFramework.clsBaseList`1.Add(T item) in D:\NET Projecten\Code
Source Sodimex - Ghost\BaseFramework\clsBaseList.vb:line 461
at DocControl.clsDocControl.GetOutlookInfo(Collection colItems, Object
oFolder, Boolean blnAttachments) in D:\NET Projecten\Code Source Sodimex -
Ghost\DocControl\Business Layer\clsDocControl.vb:line 597"
TargetSite: {System.Reflection.RuntimeMethodInfo}