Protected Sub GridView2_RowUpdating(ByVal sender As Object, ByVal e As System.Web.UI.WebControls.GridViewUpdateEventArgs) Handles GridView2.RowUpdating
        Dim SQLStr As String
        Dim createSQLquery AS Boolean
        Dim ColID as String
        Dim str as String
        dim strUser_NameSurname  as string
        dim strIdUser  as string


        'QUI CONTROLLO I CAMPI DELLA TABELLA SE VANNO BENE
        createSQLquery = TRUE

        ColId = "User_NameSurname"
        if  check_values_STRING(e, ColId, str, createSQLquery ) then
            strUser_NameSurname  = str
        else    
            goto exit_1
        End If
'
'.... etc,etc per tutti i campi
'
'**------**
exit_1:
'**------**
        If createSQLquery
            SQLStr = "UPDATE [User_Dati] " & _
                  "SET User_NameSurname=@User_NameSurname, " & _ 
                   " where UserID=@UserID "
            SqlDataSource2.UpdateCommand = SQLStr
            'SqlDataSource2.DataBind
        Else
            e.Cancel = True
        End If

'--- istruzione di UPDATE l'ho provata anche come...  ma non ha funzionato 
'                  "SET User_NameSurname='" & strUser_NameSurname & "'" & _ 
'                   " where UserID='" & strUserID  &"'"