Rename file after export based on expression DataTable in VB.Net

Dear Sir,

I'm Trying to to Export image with based filename on expression datatable in VB.NET

Imports BaiqiSoft.LabelControl

Public Class Form1
    Private m_DataTable As DataTable
    Private Sub CreateDataTable()
        If m_DataTable IsNot Nothing Then Return
        m_DataTable = New DataTable
        'Columns
        m_DataTable.Columns.Add("ProductName", GetType(String))
        m_DataTable.Columns.Add("Barcode", GetType(String))
        m_DataTable.Columns.Add("Price", GetType(Single))
        m_DataTable.Columns.Add("LabelNumber", GetType(Integer))
        m_DataTable.Columns.Add("QTY", GetType(Integer))
        m_DataTable.Columns.Add("Filename", GetType(String), "ProductName +','+ Barcode")
        'Rows
        m_DataTable.Rows.Add("Mishi Kobe Niku", "845723054943", 96.0, 2, 1)
        m_DataTable.Rows.Add("Carnarvon Tigers", "246321456231", 61.5, 1, 1)
        m_DataTable.Rows.Add("Ipoh Coffee", "589412354786", 46.0, 3, 1)
        m_DataTable.Rows.Add("Aniseed Syrup", "457125463254", 10.0, 1, 1)
        m_DataTable.Rows.Add("Teatime Chocolate Biscuits", "232145674321", 9.2, 5, 1)
    End Sub
    Private Sub Btnexport_Click(sender As Object, e As EventArgs) Handles Btnexport.Click
        Dim theLabel As New LabelPrinting()
        theLabel.LicenseKey = ""
        theLabel.OpenLabel(Application.StartupPath & "\test.blf")
        Dim count As Integer = 0
        For Each row2 As DataGridViewRow In DataGridView1.Rows
            Dim isselect As Boolean = Convert.ToBoolean(row2.Cells("checkboxcolumn").Value)
            If isselect Then
                count += 1
            End If
        Next row2
        Dim selectedRows As DataTable = m_DataTable.Clone
        selectedRows.Columns("Filename").Expression = Nothing : selectedRows.Columns("Filename").ReadOnly = False
        For Each row2 As DataGridViewRow In DataGridView1.Rows
            Dim isselect As Boolean = Convert.ToBoolean(row2.Cells("checkboxcolumn").Value)
            If isselect Then
                Dim newRow As DataRow = selectedRows.Rows.Add()
                newRow("ProductName") = m_DataTable.Rows(row2.Index)("ProductName")
                newRow("Barcode") = m_DataTable.Rows(row2.Index)("Barcode")
                newRow("Price") = m_DataTable.Rows(row2.Index)("Price")
                newRow("LabelNumber") = m_DataTable.Rows(row2.Index)("LabelNumber")
                newRow("QTY") = m_DataTable.Rows(row2.Index)("QTY")
                newRow("Filename") = m_DataTable.Rows(row2.Index)("Filename")
                theLabel.ExportOptions.FileName = newRow("Filename")
            End If

        Next row2
        theLabel.DataSource = selectedRows
        theLabel.ExportOptions.Path = Application.StartupPath
        theLabel.Label.QuantityColumn = "QTY"
        theLabel.ExportOptions.Quantity = QuantityOptions.AllRecords
        theLabel.ExportOptions.Format = ImageFormats.Png
        theLabel.ExportOptions.Resolution = 300

        theLabel.ExportImage()
    End Sub

    Private Sub Form1_Load(sender As Object, e As EventArgs) Handles MyBase.Load
        CreateDataTable()
        DataGridView1.DataSource = m_DataTable
        Dim CheckedBoxColumn As New DataGridViewCheckBoxColumn
        CheckedBoxColumn.Width = 40
        CheckedBoxColumn.Name = "checkboxcolumn"
        CheckedBoxColumn.HeaderText = "Check"
        DataGridView1.Columns.Insert(0, CheckedBoxColumn)
    End Sub
End Class

Below link library BaiqiSoft.LabelControl trial

Link share library demo

Link label sample file