مشكلة عند حفظ الفاتورة - نسخة قابلة للطباعة

PHP كود :

       If con.State = ConnectionState.Open Then con.Close()
        Dim strInsert As String = " Insert into tb1([Date],[SelMan],[total])values(@Date,@SelMan,@total)"

        cmd = New OleDb.OleDbCommand(strInsert, con)
        cmd.Parameters.Add(New OleDb.OleDbParameter("@Date", OleDb.OleDbType.VarChar)).Value = TextBox1.Text
        cmd.Parameters.Add(New OleDb.OleDbParameter("@SelMan", OleDb.OleDbType.VarChar)).Value = SelMan.Text
        cmd.Parameters.Add(New OleDb.OleDbParameter("@total", OleDb.OleDbType.VarChar)).Value = SelMdataTextBox.Text

        con.Open()

        cmd.ExecuteNonQuery()
        cmd = New OleDb.OleDbCommand("select max(id) from tb1", con)
        Dim dr As OleDb.OleDbDataReader = cmd.ExecuteReader
        dr.Read()
        'اضافة تفاصيل الفاتورة
        Dim ID_tb1 As Integer = dr(0)
        dr.Close()
        Dim code, quant As Integer

        Dim price, total As Double

        strInsert = "Insert into sell(code,ID_tb1,Name,quant,price,total)values(@code,@ID_tb1,@Name,@quant,@price,@total)"
        cmd = New OleDb.OleDbCommand(strInsert, con)

        For i As Integer = 0 To SellDataGridView.RowCount - 2
            code = SellDataGridView.Rows(i).Cells(0).Value
            Name = SellDataGridView.Rows(i).Cells(1).Value
            quant = SellDataGridView.Rows(i).Cells(2).Value
            price = SellDataGridView.Rows(i).Cells(3).Value
            total = SellDataGridView.Rows(i).Cells(4).Value
            cmd = New OleDbCommand(strInsert, con)
            cmd.Parameters.Add(New OleDb.OleDbParameter("@code", OleDb.OleDbType.Integer)).Value = code
            cmd.Parameters.Add(New OleDb.OleDbParameter("@ID_tb1", OleDb.OleDbType.Integer)).Value = ID_tb1
            cmd.Parameters.Add(New OleDb.OleDbParameter("@Name", OleDb.OleDbType.VarChar)).Value = Name
            cmd.Parameters.Add(New OleDb.OleDbParameter("@quant", OleDb.OleDbType.Integer)).Value = quant
            cmd.Parameters.Add(New OleDb.OleDbParameter("@price", OleDb.OleDbType.Currency)).Value = price
            cmd.Parameters.Add(New OleDb.OleDbParameter("@total", OleDb.OleDbType.Currency)).Value = total
            cmd.ExecuteNonQuery()
            SellDataGridView.Rows.RemoveAt(SellDataGridView.CurrentRow.Index)

        Next
        add_number()
        con.Close()
       
    End Sub

كود :

            

if code="" then msgbox("code Empty"):exit sub

code = SellDataGridView.Rows(i).Cells(0).Value

if Name ="" then msgbox("Name Empty"):exit sub    

Name = SellDataGridView.Rows(i).Cells(1).Value

if quant="" then msgbox("quant Empty"):exit sub    

quant = SellDataGridView.Rows(i).Cells(2).Value

if price="" then msgbox("price Empty"):exit sub  

price = SellDataGridView.Rows(i).Cells(3).Value

if total="" then msgbox("total Empty"):exit sub    

total = SellDataGridView.Rows(i).Cells(4).Value