Ajax 问题


var a1=TicketSell_ticketsell.ClearAll();alert(a1.value);
为什么返回的总是NULL?    [AjaxPro.AjaxMethod(AjaxPro.HttpSessionStateRequirement.ReadWrite)]
    public int ClearAll()
    {
        int result = -1;        result = ClearAllresult();        return result;
        //Label3.Text = TicketorderId.ToString() + " " + e.RowIndex.ToString();
        //MagicAjax.AjaxCallHelper.Write("document.all." + tbvoyagey.ClientID + ".focus();");    }    protected int ClearAllresult()
    {
        int result_int = -1;        TicketOrderInfo.Clear();
        TicketOrderInfo.AcceptChanges();
        Session["TicketOrderInfo"] = TicketOrderInfo;
        
        TicketTxInfo.Clear();
        TicketTxInfo.AcceptChanges();
        Session["TicketTxInfo"] = TicketTxInfo;        if (TicketOrderInfo.Rows.Count == 0)
        {
            TicketOrderInfo.Rows.Add(TicketOrderInfo.NewRow());
        }        GvTicketOrderInfo.DataSource = TicketOrderInfo;
        GvTicketOrderInfo.DataBind();        result_int = 1;
        return result_int;
    }