[Solved] ASP.Net RowDataBound event Error: Index was out of range

 Please help

System.ArgumentOutOfRangeException: 'Index was out of range. Must be non-negative and less than the size of the collection.
Parameter name: index'

Protected Sub Studentgrid_RowDataBound(sender As Object, e As GridViewRowEventArgs) Handles Studentgrid.RowDataBound
    '  Dim rowIndex As Integer = Convert.ToInt32(e.CommandArgument)
    Dim average As Decimal
    If e.Row.RowType = DataControlRowType.DataRow Then
        Try
            average = Convert.ToDecimal(e.Row.Cells(2).Text)

        Catch ex As Exception
            Console.WriteLine("{0} Exception caught.", ex)
        End Try

        Dim index As Integer = Convert.ToInt32(e.Row.RowIndex)
        'Dim row As GridViewRow = Studentgrid.Rows(index)
        Dim classr As String = Studentgrid.Rows(index).Cells(6).Text
        Dim cut As Decimal
        Using Con As New SqlConnection(conString)
            Con.Open()
            Using Com2 As New SqlCommand("SELECT * FROM cutoff WHERE class = '" & classr & "'", Con)
                Using RDR2 = Com2.ExecuteReader()
                    If RDR2.HasRows Then
                        RDR2.Read()
                        cut = RDR2.Item("verage").ToString
                    End If
                End Using
            End Using
        End Using

        If average < cut Then
            e.Row.Cells(0).Text = "Failed"
            e.Row.Cells(0).ForeColor = System.Drawing.Color.Red
        Else
            e.Row.Cells(0).Text = ""
        End If
        If average = 0 Then
            e.Row.Cells(0).Text = ""
        End If
    End If
End Sub

<asp:GridView ID="Studentgrid" runat="server" ItemStyle-Width="Auto" AutoGenerateColumns="False">
    <Columns>
        <asp:BoundField HeaderText="Status" />
        <asp:ButtonField CommandName="Select" HeaderText="Payments" Text="Payments" />
        <asp:BoundField AccessibleHeaderText="Average" DataField="Average" HeaderText="Average"></asp:BoundField>
        <asp:BoundField DataField="account" HeaderText="Admno" SortExpression="account" />
        <asp:BoundField DataField="Name" HeaderText="Names" SortExpression="Name" />
        <asp:BoundField DataField="Class" HeaderText="Class" SortExpression="Class" />
        <asp:BoundField DataField="intake" HeaderText="Intake" SortExpression="intake" />
        <asp:BoundField DataField="amounts" HeaderText="Amount" SortExpression="amount" />
        <asp:BoundField DataField="commitment" HeaderText="PayStatus" SortExpression="commitment" />
        <asp:BoundField DataField="Comment" HeaderText="Comment" SortExpression="Comment" />
    </Columns>
</asp:GridView>