Strange issue with Datagridview-Rows not displayed - vb.net

Question

I have a Datagridview connected to a dataset.The problem is that occasionally,when the data is refreshed,it is not displayed in the DGV.The code is:
Private Sub DisplayInDGV()
Dim SQLSet As String
Dim DASet As New OleDb.OleDbDataAdapter
Dim DSSet As New DataSet
SQLSet = "Select * From SetDisplayTable"
DASet = New OleDb.OleDbDataAdapter(SQLSet, Con)
DSSet.Clear()
DASet.Fill(DSSet, "DSSetHere")
With DGVSetView
.Refresh()
.AutoGenerateColumns = False
.DataSource = Nothing
.DataSource = DSSet.Tables(0)
.Update()
DGVSetView.Columns(i).DataPropertyName = DSSet.Tables(0).Columns(i).ToString
.Columns(0).DataPropertyName = DSSet.Tables(0).Columns(0).ToString
.Columns(2).DataPropertyName = DSSet.Tables(0).Columns(1).ToString
.Columns(3).DataPropertyName = DSSet.Tables(0).Columns(2).ToString
.Columns(4).DataPropertyName = DSSet.Tables(0).Columns(3).ToString
.Columns(5).DataPropertyName = DSSet.Tables(0).Columns(4).ToString
.Columns(6).DataPropertyName = DSSet.Tables(0).Columns(5).ToString
.Columns(7).DataPropertyName = DSSet.Tables(0).Columns(6).ToString
.Columns(8).DataPropertyName = DSSet.Tables(0).Columns(7).ToString
.Columns(9).DataPropertyName = DSSet.Tables(0).Columns(8).ToString
.Columns(10).DataPropertyName = DSSet.Tables(0).Columns(9).ToString
.Columns(11).DataPropertyName = DSSet.Tables(0).Columns(10).ToString 'Item Unique Code for Hot Edit
.Columns(14).DataPropertyName = DSSet.Tables(0).Columns(12).ToString
End With
'Updating Totals/::
For ItemRow As Integer = 0 To DGVSetView.Rows.Count - 1
If DGVSetView.Rows(ItemRow).Cells(14).Value = True Then
DGVSetView.Rows(ItemRow).Cells(12).Value = DGVSetView.Rows(ItemRow).Cells(10).Value
ElseIf DGVSetView.Rows(ItemRow).Cells(14).Value = False Then
DGVSetView.Rows(ItemRow).Cells(13).Value = DGVSetView.Rows(ItemRow).Cells(10).Value
End If
Next
'Updating School and general totals in DGV//:
Dim SchoolTotal, GeneralTotal As Decimal
For ColumnTotal As Integer = 0 To DGVSetView.Rows.Count - 1
SchoolTotal += DGVSetView.Rows(ColumnTotal).Cells(12).Value
GeneralTotal += DGVSetView.Rows(ColumnTotal).Cells(13).Value
Next
txtSchoolAmtFinal.Text = SchoolTotal
txtGeneralAmtFinal.Text = GeneralTotal
DGVSetView.Update()
'Get gross total of the DGV amount column//:
If DGVSetView.RowCount <> 0 Then
Dim GrossAmt As Decimal = 0
For Index As Integer = 0 To DGVSetView.RowCount - 1
' GrossAmt += Convert.ToDecimal(DataGridView1.Rows(Index).Cells(11).Value)
If Str(DGVSetView.Rows(Index).Cells(10).Value) = "Null" Or (DGVSetView.Rows(Index).Cells(10).Value) <= 0 Then
MsgBox("Item Number " & (DGVSetView.Rows(Index).Cells(10).Value) & " is either blank or 0", MsgBoxStyle.Exclamation, "Item Error")
Else
GrossAmt += Convert.ToDecimal(DGVSetView.Rows(Index).Cells(10).Value)
End If
Next
txtInsertGrossAmt.Text = GrossAmt ' - Val(DGVSetView.Text)
Call SetNetAmount()
End If
'Generate Serial//:
Dim X As Integer
Do While X < DGVSetView.Rows.Count
DGVSetView.Item(0, X).Value = X + 1
X = X + 1
Loop
'Disbaling editing in all columns except pending//:
With DGVSetView
.Columns(0).ReadOnly = True
.Columns(2).ReadOnly = True
.Columns(3).ReadOnly = True
.Columns(4).ReadOnly = True
.Columns(5).ReadOnly = True
.Columns(6).ReadOnly = True
.Columns(7).ReadOnly = True
.Columns(8).ReadOnly = True
.Columns(9).ReadOnly = True
.Columns(10).ReadOnly = True
End With
txtTotalItems.Text = DGVSetView.Rows.Count
For Each r As DataGridViewRow In DGVSetView.Rows
r.Cells(1).Value = True
Next r
End Sub
The problem is that occasionally,the DGV will not show any rows and displays a blank frame.At such instances.if I check in DGV.Rows.count
the result is 0 despite there being underlying data in the table.
Note that this happens randomly.At other times the DGV refreshed properly and also displays data correctly.
Also note that this DGV resides within a TabControl.
Further,when the DGV fails to display the data,the totals which I have calculated in the above sub procedure return zero value.As such the problem appears to lie somewhere in the rows not being inserted in the DGV.
Thank you.
Khalid.
//Edit;Code Updated:
#jmcilhinney I have updated my code as follows.However,the earlier problem of the DGV going blank occasionally persists.Also the update process has slowed down slightly.It seems I may be making a mistake in the location of placing the Suspend and ResumeBinding statements:
Private Sub SetPreview()
Dim SQLSet As String
Dim DASet As New OleDb.OleDbDataAdapter
Dim DSSet As New DataSet
SQLSet = "Select * From SetDisplayTable"
Dim DTDGV As New DataTable
Dim DGVBindingSource As New BindingSource
DASet = New OleDb.OleDbDataAdapter(SQLSet, Con)
DASet.Fill(DTDGV)
DGVBindingSource.DataSource = DTDGV
DGVBindingSource.ResumeBinding()
With DGVSetView
.AutoGenerateColumns = False
.DataSource = DGVBindingSource
.Columns(0).DataPropertyName = DTDGV.Columns(0).ToString
.Columns(2).DataPropertyName = DTDGV.Columns(1).ToString
.Columns(3).DataPropertyName = DTDGV.Columns(2).ToString
.Columns(4).DataPropertyName = DTDGV.Columns(3).ToString
.Columns(5).DataPropertyName = DTDGV.Columns(4).ToString
.Columns(6).DataPropertyName = DTDGV.Columns(5).ToString
.Columns(7).DataPropertyName = DTDGV.Columns(6).ToString
.Columns(8).DataPropertyName = DTDGV.Columns(7).ToString
.Columns(9).DataPropertyName = DTDGV.Columns(8).ToString
.Columns(10).DataPropertyName = DTDGV.Columns(9).ToString
.Columns(11).DataPropertyName = DTDGV.Columns(10).ToString 'Item Unique Code for Hot Edit
.Columns(14).DataPropertyName = DTDGV.Columns(12).ToString
End With
DGVBindingSource.SuspendBinding()
'Updating Totals/::
For ItemRow As Integer = 0 To DGVSetView.Rows.Count - 1
If DGVSetView.Rows(ItemRow).Cells(14).Value = True Then
DGVSetView.Rows(ItemRow).Cells(12).Value = DGVSetView.Rows(ItemRow).Cells(10).Value
ElseIf DGVSetView.Rows(ItemRow).Cells(14).Value = False Then
DGVSetView.Rows(ItemRow).Cells(13).Value = DGVSetView.Rows(ItemRow).Cells(10).Value
End If
Next
'Updating School and general totals in DGV//:
Dim SchoolTotal, GeneralTotal As Decimal
For ColumnTotal As Integer = 0 To DGVSetView.Rows.Count - 1
SchoolTotal += DGVSetView.Rows(ColumnTotal).Cells(12).Value
GeneralTotal += DGVSetView.Rows(ColumnTotal).Cells(13).Value
Next
txtSchoolAmtFinal.Text = SchoolTotal
txtGeneralAmtFinal.Text = GeneralTotal
DGVSetView.Update()
'Get gross total of the DGV amount column//:
If DGVSetView.RowCount <> 0 Then
Dim GrossAmt As Decimal = 0
For Index As Integer = 0 To DGVSetView.RowCount - 1
' GrossAmt += Convert.ToDecimal(DataGridView1.Rows(Index).Cells(11).Value)
If Str(DGVSetView.Rows(Index).Cells(10).Value) = "Null" Or (DGVSetView.Rows(Index).Cells(10).Value) <= 0 Then
MsgBox("Item Number " & (DGVSetView.Rows(Index).Cells(10).Value) & " is either blank or 0", MsgBoxStyle.Exclamation, "Item Error")
Else
GrossAmt += Convert.ToDecimal(DGVSetView.Rows(Index).Cells(10).Value)
End If
Next
txtInsertGrossAmt.Text = GrossAmt ' - Val(DGVSetView.Text)
Call SetNetAmount()
End If
'Disabling editing in all columns except pending//:
With DGVSetView
.Columns(0).ReadOnly = True
.Columns(2).ReadOnly = True
.Columns(3).ReadOnly = True
.Columns(4).ReadOnly = True
.Columns(5).ReadOnly = True
.Columns(6).ReadOnly = True
.Columns(7).ReadOnly = True
.Columns(8).ReadOnly = True
.Columns(9).ReadOnly = True
.Columns(10).ReadOnly = True
End With
txtTotalItems.Text = DGVSetView.Rows.Count
For Each r As DataGridViewRow In DGVSetView.Rows
r.Cells(1).Value = True
Next r
End Sub