finally i can debugger to debug the error is from this line of code

  If frmMDI.UltraTabbedMdiManager1.TabGroups.Count > 0 Then
                For i As Integer = 0 To frmMDI.UltraTabbedMdiManager1.TabGroups(0).Tabs.Count - 1
                    If frmMDI.UltraTabbedMdiManager1.TabGroups(0).Tabs(i).Form.GetType.Equals(frmLifter.GetType) Then
                        If frmMDI.UltraTabbedMdiManager1.TabGroups(0).Tabs(i).Form.Text = LifterId Then
                            Dim F As frmLifter = CType(frmMDI.UltraTabbedMdiManager1.TabGroups(0).Tabs(i).Form, frmLifter)

                            If Not F.grdAlarm.DataSource Is Nothing Then

                                Dim DTAlarm As DataTable = CType(F.grdAlarm.DataSource, DataTable)

                                DTAlarm.Rows.Add(New Object() {CDate(DT), StatusId, StatusMsg, BackColor.ToArgb})

                                F.grdAlarm.DataSource = DTAlarm
                                'If DTAlarm.Rows.Count <> 0 Then
                                F.grdAlarm.ActiveRow = F.grdAlarm.Rows(F.grdAlarm.Rows.Count - 1)

                                F.lblAlarm.Text = StatusMsg
                                F.lblAlarm.BackColor = BackColor
                                F.LatestStatusIsBlinking = IsBlinking
                                F.LatestStatusColor = BackColor
                                F.LatestStatusDT = DT
                                frmMDI.tsslStatus.Text = DT & " " & LifterId & ":" & StatusMsg
                                'End If
                            End If

                        End If

                    End If
                Next
            End If

when it come to that line

Dim DTAlarm As DataTable = CType(F.grdAlarm.DataSource, DataTable)

it show me: Datatable internal index is corrupted: 13 

what is the problem? 

If you can duplicate this error in a small sample project then I would recommend submitting the issue to Infragistics Developer Support.

Otherwise, I'm not sure how much help I can offer you here if your DataTable is somehow getting corrupted. If you can debug to that line of code, does that mean you can get a call stack that shows where the exception is occurring? It might help if you post that info here.  

I am also having the same issue. I have been using Infragistic components for 2 years now with no issues of this type. I just upgraded to .Net 3.5 and installed Visual Studio 2008. I now get the Red Cross accross a whole suite of items, at random, not just ultragrids but also the menu, pie charts etc... This appears to be a generic problem with latest Microsoft patches.

 Please advise how we can fix this

This issue is being reported and I see that it is spreading.

I would like to know if all users who have this issue are currently using Vista with the latest patches as it does not appear with our XP installations.

Yes, I'm also having this issue.  My grid is bound to a datatable. Then I periodically re-fetch the data for that table and show the latest data on the grid. I am using BackgroundWorker to do the fetaching. Recently, it keeps getting 'Big Red X' randomly since last Novemember (if my memo is right). Following is the stack trace for the exception. I am using VS2005, .Net Framework 2. Our product is installed in XP Pro with SP2.

 Please let me know whether this 'Red Cross' issue is fixed or not.  Thanks!

Fei.

System.Data at System.Data.RBTree`1.GetNodeByIndex(Int32 userIndex) at System.Data.DataView.GetRecord(Int32 recordIndex) at System.Data.DataView.CreateChildView(DataRelation relation, Int32 recordIndex) at System.Data.DataRelationPropertyDescriptor.GetValue(Object component) at Infragistics.Win.UltraWinGrid.RowsCollection.get_Data_List() at Infragistics.Win.UltraWinGrid.RowsCollection.get_BindingList() at Infragistics.Win.UltraWinGrid.RowsCollection.SyncRows() at Infragistics.Win.UltraWinGrid.RowsCollection.EnsureNotDirty() at Infragistics.Win.UltraWinGrid.ScrollCountManagerSparseArray.VerifyAgainstScrollVersion() at Infragistics.Win.UltraWinGrid.RowsCollection.GetVisibleRowCount(IncludeRowTypes includeRowTypes) at Infragistics.Win.UltraWinGrid.UltraGridRow.HasChild(UltraGridBand band, Boolean excludeHidden, IncludeRowTypes includeRowTypes) at Infragistics.Win.UltraWinGrid.UltraGridRow.get_HasExpansionIndicator() at Infragistics.Win.UltraWinGrid.RowColRegionIntersectionUIElement.PositionChildElements() at Infragistics.Win.UIElement.VerifyChildElements(ControlUIElementBase controlElement, Boolean recursive) at Infragistics.Win.UltraWinGrid.RowColRegionIntersectionUIElement.VerifyChildElements(ControlUIElementBase controlElement, Boolean recursive) at Infragistics.Win.UIElement.DrawElement(UIElementDrawParams& defaultDrawParams) at Infragistics.Win.UIElement.DrawChildElements(UIElementDrawParams& drawParams) at Infragistics.Win.UIElement.DrawElement(UIElementDrawParams& defaultDrawParams) at Infragistics.Win.UIElement.DrawChildElements(UIElementDrawParams& drawParams) at Infragistics.Win.UIElement.DrawElement(UIElementDrawParams& defaultDrawParams) at Infragistics.Win.UIElement.DrawHelper(Graphics graphics, Rectangle invalidRectangle, Boolean doubleBuffer, AlphaBlendMode alphaBlendMode, Boolean clipText, Boolean forceDrawAsFocused) at Infragistics.Win.UIElement.Draw(Graphics graphics, Rectangle invalidRectangle, Boolean doubleBuffer, AlphaBlendMode alphaBlendMode) at Infragistics.Win.ControlUIElementBase.Draw(Graphics graphics, Rectangle invalidRectangle, Boolean doubleBuffer, AlphaBlendMode alphaBlendMode, Size elementSize) at Infragistics.Win.ControlUIElementBase.Draw(Graphics graphics, Rectangle invalidRectangle, Boolean doubleBuffer, AlphaBlendMode alphaBlendMode) at Infragistics.Win.UltraWinGrid.UltraGridUIElement.Draw(Graphics graphics, Rectangle invalidRectangle, Boolean doubleBuffer, AlphaBlendMode alphaBlendMode) at Infragistics.Win.UltraControlBase.OnPaint(PaintEventArgs pe) at Infragistics.Win.UltraWinGrid.UltraGrid.OnPaint(PaintEventArgs pe) at System.Windows.Forms.Control.PaintWithErrorHandling(PaintEventArgs e, Int16 layer, Boolean disposeEventArgs) at System.Windows.Forms.Control.WmPaint(Message& m) at System.Windows.Forms.Control.WndProc(Message& m) at System.Windows.Forms.Control.ControlNativeWindow.OnMessage(Message& m) at System.Windows.Forms.Control.ControlNativeWindow.WndProc(Message& m) at System.Windows.Forms.NativeWindow.Callback(IntPtr hWnd, Int32 msg, IntPtr wparam, IntPtr lparam)

I had a similar problem using DoWork to fill the datasets.  Usually there would be no error, but the datasets were only partially filled.  When there was an error, it was often too vague to be of any use.  Finally I got the "System.InvalidOperationException: DataTable internal index is corrupted: '13'." error, which pointed to filling the datasets in a separate thread.  I was able to get it to work by adding "System.Threading.Thread.Sleep(200);" before the fills.  To be extra safe, I removed the separate thread call entirely, and put the fills back into form_Load, without the experimental delay.

BTW Mike, you do amazing work.  To think of what I could do if I had your patience!

There hasn't been any activity in this thread for a while. But I post a comment anyway:

Today I had problems with the "red cross". Had similar problem some time a go too. Then it was a cross-threading problem. I was pretty sure it was now too, but I couldn't find the bug.

In form event handlers that have a chance of getting events from other threads than the gui thread I always use the test:

  this.Invoke(<my delegate to the same method as the current one>);

else

hcox said:

It does not appear that infragistics are taking our issues seriously, their answer "your problem, you deal with it, just keep paying the licence fees."

Our licence is up for renewal and we are now looking elsewhere for a provider that is more client focused and actually gets off his backside to support his clients.

Not a good experience so far with infragistics.

I really don't think this is an accurate characterization of my responses here. I cannot simply wave a magic wand and fix this issue or even determine it's cause. All I can do here on a forum post is use my experience and knowledge to try to guess what the problem might be and offer a possible course of action. 

In my experience, the issue desribed above is almost certainly an issue with the improper use of threading. The exception is likely occurring because the grid is trying to access data at a point where the data is out of synch because it has not been properly marshalled to the UI Thread. I could be wrong. But without a call stack or a sample application, that's the best guess I can make. 

I cannot duplicate all possible documentation on using threads here in this forum, nor would it make any sense to do so, since this has nothing specifically to do with the grid control, it's a general programming technique in DotNet development. 

I suggested no less than three times in this thread that the developers report these problems to Infragistics Developer support and submit sample applications so that the developer support reps can duplicate the problem and try to determine if it's an issue with the grid control.

What other assistance do you imagine I can offer that I am (for some unknown reason) holding back?

It does not appear that infragistics are taking our issues seriously, their answer "your problem, you deal with it, just keep paying the licence fees."

Our licence is up for renewal and we are now looking elsewhere for a provider that is more client focused and actually gets off his backside to support his clients.

Not a good experience so far with infragistics.

fei_css said:

In DoWork Event, I only fetch data and merge data. NO UI operation is involved at all.

When you merge the data, are you merging into the data source that grid is bound to? If so, then you may be causing the data source to send notifications across threads.  

fei_css said:

When I look at the stack trace, why they all point to the Infragistics routines?

Since you didn't post your call stack, I can't really guess. But the fact that it shows Infragistics methods doesn't really mean anything. The fact that the exception occurs in the grid code just means that the grid tried to do something and failed. Why it failed is the issue. It probably fails because the data source is in a state where it cannot be accessed by the UI thread.