salve ragazzi avrei un piccolo problema:

codice:
        If Page.IsPostBack Then
            Dim newdate As New Class1
            Dim dataoggi = (newdate.datetrans(Today.ToShortDateString))
            Dim strSQL As String
            strSQL = "insert into rapportini (utente,idcliente,tipo,ore,data) values ('" & Membership.GetUser.ToString & "'," & DropDownList1.SelectedValue & ",'" & TextBox2.Text.ToString & "'," & CInt(TextBox3.Text) & "," & dataoggi & " )"
            'Response.Write(strSQL)
            Dim conn As New SqlConnection(ConfigurationManager.ConnectionStrings("IntranetConnectionString").ConnectionString)
            Dim Command As New SqlCommand(strSQL, conn)
            conn.Open()
            Command.ExecuteNonQuery()


            ' conn.Open()




            Label1.Text = "Record inserito perfettamnete"
            GridView1.DataSourceID = "SqlDataSource2"
            SqlDataSource2.SelectCommand = "select * from rapportini where utente='" & Membership.GetUser.ToString & "' and data=" & dataoggi & " order by id"
            GridView1.DataBind()
        End If
se faccio un refresh page mi inserisce nuovamnte il record :master:

grazie