The Following is the place where i am getting this error

Try

If (Me.InvokeRequired) Then
'Me.Invoke(New MethodInvoker(AddressOf chk1, i))
Me.Invoke(New MethodInvoker(Function()


' Define a handler for unhandled exceptions for threads behind forms.
AddHandler Application.ThreadException, AddressOf MYThreadHandler

Try


Select Case Me.grdFilesUploadProgress.Rows(UGrow.Index).Cells(0).Value.ToString()

Case "BOM Parts List"



Me.grdFilesUploadProgress.DisplayLayout.Bands(0).Columns(2).MinValue = 0

'Code to Process BOM Parts List files

Dim ObjBOM As New clsImportMachineBOM(intOrganisationId)
ObjBOM.DeleteInputMachineBOMData(3)
clcmaxval_rows = ObjBOM.FnBulkCopyFromCSVToDB(Me.grdFilesUploadProgress.Rows(UGrow.Index).Cells(1).Value.ToString())

'Setting the maximum value for the Progressbar
If clcmaxval_rows.Count > 0 Then
Me.grdFilesUploadProgress.DisplayLayout.Bands(0).Columns(2).MaxValue = clcmaxval_rows(1)
intRowsAffcted = clcmaxval_rows(2)
End If

Me.grdFilesUploadProgress.Rows(UGrow.Index).Cells(2).Value = intRowsAffcted
Application.DoEvents()
' ObjBOM = Nothing


Case "Production Plan", "Install Base"

Me.grdFilesUploadProgress.DisplayLayout.Bands(0).Columns(2).MinValue = 0
Me.grdFilesUploadProgress.DisplayLayout.Bands(0).Columns(2).MaxValue = dtinfotbl.Rows.Count

For Each dtrow In dtinfotbl.Rows



intProdId = objCommon.GetProductId(dtrow(0), intOrganisationId, 1)

'Code to Process ProductionPlan type of files
If Me.grdFilesUploadProgress.Rows(UGrow.Index).Cells(0).Value.ToString() = "Production Plan" Then

Dim objProdPlanImport As New clsImportProductionPlan(intOrganisationId, CType(dtrow(1), Integer), CType(dtrow(2).ToString().Trim(), Integer), intProdId, CType(dtrow(3), Integer))
blnresult = objProdPlanImport.fnImportProductionPlan(2)
If blnresult = True Then
intRowsAffcted += 1
End If
Me.grdFilesUploadProgress.Rows(UGrow.Index).Cells(2).Value = intRowsAffcted
Application.DoEvents()
'objProdPlanImport = Nothing
'Code to Process Installbase type of files
ElseIf Me.grdFilesUploadProgress.Rows(UGrow.Index).Cells(0).Value.ToString() = "Install Base" Then

Dim ObjInstallBase As New ClsImportInstallBase(intOrganisationId, intProdId, CType(dtrow(1).ToString(), Integer), CType(dtrow(2).ToString.Trim(), Integer))
blnresult = ObjInstallBase.fnImportInstallBase(2)
If blnresult = True Then
intRowsAffcted += 1
End If
Me.grdFilesUploadProgress.Rows(UGrow.Index).Cells(2).Value = intRowsAffcted
Application.DoEvents()
'ObjInstallBase = Nothing
End If

If blnClosed = True Then
End
End If

Next

End Select


'Threading.Thread.Sleep(500)


Me.grdFilesUploadProgress.DisplayLayout.Rows(UGrow.Index).Cells(2).Style = ColumnStyle.CheckBox
Me.grdFilesUploadProgress.Rows(UGrow.Index).Cells(2).Value = True
blnSuccess = True

Return Nothing

Catch ex As Exception
blnSuccess = False
fnImportByRow_Ex(UGrow.Index, intRowsAffcted.ToString() & " Row Completed.. Error Loading file. Refer to Log File")
Return Nothing
End Try

End Function))
End If

Return blnSuccess
Catch ex As Exception
Throw ex
End Try

From what event is this code being called?

The exception you are getting here is almost certainly a threading issue.

As I mentioned (several times) in the other thread you posted, you cannot mix DataBinding and multiple threads. Your use of InvokeRequired and BeginInvoke here will not help, because there is all sorts of communication going on between the grid, the BindingManager, and the data source over which you have no control.

i have written this code in a seperate function and i have called this function within backgroundworker_dowork() event.....

Yes Mike. i understood what you r saying. So please give me any alternative solution and how to do it please..... and also please send me any samples

Okay, I'm really confused. If this method is called on a background worker and you are checking InvokeRequired, then this will always be true and you are marshalling this method back to the UI Thread.

So the thread is completely pointless. You are doing everything on the UI Thread, anyway. Unless there is some other code being run on the background thread.

As for how to do this the correct way, I would just ditch the threading altogether and update the progress bar cells synchronously. If you must do it asynchronously, then I would recommend using a Windows Forms Timer, which operates on the UI Thread.