Caio a tutti sono incastrato su una cosa e non riesco a capire dove sbaglio.

Sto cencando di legare la gridview ad un bottone personalizzato ma purtroppo la funzione non mi risponde... cioè nn mi stampa quella riga prrrrrr perchè? grazie a tt ecco il code
codice:
<%@ Page Language="VB" %>
<%@ Import Namespace="System.Data.OleDb" %>

<script runat="server">   
    Protected Sub Button1_Click(ByVal sender As Object, ByVal e As System.EventArgs)
        If FileUpload1.HasFile Then
            Try
                'FileUpload1.SaveAs("D:\APPLICATIONS\INTRANET-3P\upload\" & Request("CodAss") & "-" & FileUpload1.FileName)
                Dim DirSave As String
                DirSave = "D:\APPLICATIONS\INTRANET-3P - TEST\"
                FileUpload1.SaveAs(DirSave & "upload\" & Request("CodAss") & "-" & FileUpload1.FileName)
               
                Label1.Text = "Upload Effettuato"
                
                Dim dbconn, sql, dbcomm
                dbconn = New OleDbConnection("Provider=SQLOLEDB;Data Source=SERVER-AP;Initial Catalog=3P-TEST;User Id=sa;Password=Password1;")
                dbconn.Open()
                sql = "INSERT INTO allegati (all_codass, all_descrizione, all_dirallegato) VALUES ('" & Request("CodAss") & "', '" & Request("Descrizione") & "', 'upload/" & Request("CodAss") & "-" & FileUpload1.FileName & "')"
                dbcomm = New OleDbCommand(sql, dbconn)

                dbcomm.ExecuteNonQuery()
                dbconn.Close()

                GridView1.DataBind()
                
            Catch ex As Exception
                Label1.Text = "ERROR: " & ex.Message.ToString()
            End Try
        Else
            Label1.Text = "Non hai specificato un file."
        End If
        
    End Sub
    
    Protected Sub GridView1_RowCommand(ByVal sender As Object, ByVal e As System.Web.UI.WebControls.GridViewCommandEventArgs)
        Response.Write("prrrrr")
    End Sub
</script>

<html xmlns="http://www.w3.org/1999/xhtml" >
<head id="Head1" runat="server">
    <title>Upload Files</title>
</head>
<body>
    <form id="form1" runat="server">
        <div style="height: 137px">
            
            <asp:FileUpload ID="FileUpload1" runat="server" style="width:217px;" /> 
            <span style="margin-left:50px;">Descrizione : <input type="text" runat="server" id="Descrizione"></span>
            <asp:Button ID="Button1" runat="server" OnClick="Button1_Click" Text="Upload File" height="22px" style="" width="85px" />

            <asp:Label ID="Label1" runat="server"></asp:Label>
            

            


            <asp:SqlDataSource ID="SqlDataSource1" runat="server" 
                ConnectionString="<%$ ConnectionStrings:3PConnection %>"                 
                SelectCommand="SELECT [all_codass], [all_descrizione], [all_dirallegato] FROM [allegati] WHERE ([all_codass] = @all_codass)">
                <SelectParameters>
                    <asp:QueryStringParameter Name="all_codass" QueryStringField="CodAss" Type="Int32" />
                </SelectParameters>
            </asp:SqlDataSource>

            <asp:GridView ID="GridView1" name="GridView1" runat="server" AutoGenerateColumns="False" 
                CellPadding="4" DataSourceID="SqlDataSource1" EnableModelValidation="True" 
                ForeColor="#333333" GridLines="None">
                <AlternatingRowStyle BackColor="White" />
                <Columns>
                    <asp:BoundField DataField="all_descrizione" HeaderText="Descrizione Allegato" SortExpression="all_codass" />
                    <asp:BoundField DataField="all_dirallegato" HeaderText="Percorso" SortExpression="all_dirallegato" />
                    <asp:TemplateField>
                      <ItemTemplate>
                        <asp:Button ID="Delete" runat="server" CommandName="Del" Text="Delete" />
                      </ItemTemplate> 
                    </asp:TemplateField>
                </Columns>
                <EditRowStyle BackColor="#2461BF" />
                <FooterStyle BackColor="#507CD1" Font-Bold="True" ForeColor="White" />
                <HeaderStyle BackColor="#507CD1" Font-Bold="True" ForeColor="White" />
                <PagerStyle BackColor="#2461BF" ForeColor="White" HorizontalAlign="Center" />
                <RowStyle BackColor="#EFF3FB" />
                <SelectedRowStyle BackColor="#D1DDF1" Font-Bold="True" ForeColor="#333333" />
            </asp:GridView>

        </div>
    </form>

</body>
</html>