Newbie here!
How can I do this?


TextBox1.Text = sender.text & ","


TextBox1.Text = TextBox1.Text & sender.text


        Dim qty As String = TextBox1.Text.Substring(0, TextBox1.Text.ToString.LastIndexOf(","))
        Dim itemName As String = TextBox1.Text.Replace(qty & ",", "")
        DataGrid.Rows.Add(itemName, "", "", qty)


Label.Text = DataGrid.Rows(index).Cells(index).Value

Thanks for your response!
Sorry Sir, but I have no Idea on where/what event I should put the codes...
Can you please elaborate it more?
Thanks a lot!

put the code of step1 in all qty button click and you can put the codes of step2, step3 and step4 in all item button click

Oh thank you so much!