because if I enter a new line in the datagridview, this is overwritten in the first line vb.net

I'm doing a point-of-sale system with barcode reader. The data that I upload to a datagridview, I add in the column "Quantity" articles with the same barcode, adds them automatically, but when reading another article with different code when you insert the first read into a new line, but if you add another article, write it in the first line of the datagridview. You can help me add some of the code for further explanation

Dim Row As Integer = 0
Dim i As Integer
Dim Amount As Integer = 0
Dim exists as Boolean = False





Private Sub txt_No_Factura_KeyPress (sender ByVal As Object, ByVal and As System.Windows.Forms.KeyPressEventArgs) Processes txt_No_Factura.KeyPress
Dim code as a string

If txt_No_Factura.Text <> "" "Then
Try it

If (e.KeyChar = (Convert.ToChar (Keys.Enter))) Then
Dim connection as SqlConnection
Connection = New SqlConnection ("Data Source = Gabriel-PC  SQLEXPRESS; Start Catalog = Sales; Integrated Security = True")
Open connection ()
Dim Code As String = txt_No_Factura.Text
Dim String As String = "Select Barcode, ID Product, Name, Sales Price from Product, where Barcode =" "& Cod &" "
Dim command as SqlCommand
Command = New SqlCommand (String, Connection)
Dim register as SqlDataReader
record = command.ExecuteReader ()
record.Read ()


cod_barra.Text = record (0)
txt_idproducto.Text = record (1)
txt_nombreProduct.Text = record (2)
txt_precioUnitario.Text = record (3)

datalistado.ColumnCount = 5
With datalistado
Columns (0) .Name = "Quantity"
.Columns (1) .Name = "Barcode"
.Columns (2) .Name = "Product Code"
.Columns (3) .Name = "Name"
.Columns (4) .Name = "Sell Price"
End with
Connection. Shut down ()

If datalistado.Rows.Count = Nothing Then
Amount + = 1
datalistado.Rows.Add ()
datalistado.Rows (f) .Cells (0) .Value = Quantity.ToString () - 1
datalistado.Rows (f) .Cells (1) .Value = cod_barra.Text
datalistado.Rows (f) .Cells (2) .Value = txt_idproducto.Text
datalistado.Rows (f) .Cells (3) .Value = txt_nombreProduct.Text
datalistado.Rows (f) .Cells (4) .Value = txt_precioUnitario.Text
= F = f + 1
txt_No_Factura.Text = ""
When

If datalistado.Rows.Count> 0, then
For line As Integer = 0 To datalistado.Rows.Count - 1
If datalistado.Rows (row) .Cells (1) .Value = cod_barra.Text Then & # 39; cod.toString ()
exists = true
else
is = wrong
When

Continue

When

If present = true then
= F = f + 1
Amount + = 1
datalistado.Rows (row) .Cells (0) .Value = (Quantity.ToString () - 1)
datalistado.Rows (row) .Cells (1) .Value = cod_barra.Text
datalistado.Rows (row) .Cells (3) .Value = txt_nombreProduct.Text
datalistado.Rows (row) .Cells (4) .Value = txt_precioUnitario.Text
txt_No_Factura.Text = "" & # 39; add this
= F = f + 1
When
If it exists = False Then
datalistado.Rows.Add (txt_cantiad.Text, cod_barra.Text, txt_idproducto.Text, txt_nombreProduct.Text, txt_precioUnitario.Text)
= F = f + 1
txt_No_Factura.Text = ""
When
When
Intercept Ex exception
MessageBox.Show ("The item was not registered when I entered the store")
Try the end


End If & if; end of if to confirm that the text is not empty x

End Sub

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One idea I had was perhaps that there are special hexadecimal keyboards. However, a quick search does not take place everywhere.

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php – Enter a number and display the next 100 even numbers. Help

I'm new to php, I make a program that receives any number and displays the next 100 even numbers. However, I open the site, it already displays a result without entering anything.

Exercise 3








Calculate the calculation


Result:

<? php $ number = $ _GET['numero']; C = 0; while ($ c <= 100) { if ($numero % 2 == 0) { echo "$numero "; } $numero++; $c++; } ?>

Is it possible to assign a keyboard as an enter key?

I often work with CAD. With this CAD my right hand is almost always with the mouse. When I work with drawing, I often have to press Enter to accept or terminate a command that I'm working with. But with my right hand, the mouse is handled and the enter key is on the right hand, so it does not work easily or effectively.

Then my question is, is one way to assign another key that acts as the enter key (there are 2 keys that act like enter). My favorite is the Windows key as it is on the left and bottom side between CTRL / Fn and ALT. I almost never use this Windows key, so you can change the function.

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I want to know in the right way whether a project exists in a query, based on that result, whether actions should be applied and whether no other new actions are being applied.

SQL code:

SELECT NEWID (), r.Project, r.Import, r.ClassCosy, r.CutSelect, r.NumHours, r.Provider,
r.TypeService, r.FolioSantec, r.Ambiente, r.Tecnologia, case, if r.Ambiente = & # 39; PRE & # 39 ;, then r.NumHoras * m.TarifaOLC, else

IF EXISTS (SELECT * FROM db_Incurrido.dbo.GSE_Real gse WHERE gse.Proyecto = r.proyecto)
BEGINNING
SELECT 1
THE END
ELSE
BEGINNING
SELECT 2
THE END

End of imports OLC
FROM db_Incurrido.dbo.GSE_Real r (nolock)
left outer join db_Incurrido.dbo.FYCG_Migracion_TarifaMedia m (nolock) on r.FolioSantec = m.Proyecto;

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