public void AutoSelect()
    {
        base.DataBind();
        pnlEmpty.Visible = false;
        SiteConfigurationSection section = SiteConfigurationSection.GetSection();
        methods = ShippingService.GetShippingMethods(ShippingPackage.GetShippingPackage(Cart.Get(),
            (Address)Session["ShippingAddress"], section.LocationCountry, section.LocationState, section.LocationCity, section.LocationZipcode));
        rptShippingMethods.DataSource = methods;
        rptShippingMethods.DataBind();
        Session["ShippingMethod"] = methods[0];
       
    }

2 - On OnepageCheckOut.ascx.cs on Page_Load, I added :

                if (CheckoutPaymentTypeEnum.PaypalExpress != paymentOption.CheckoutPaymentType) {
                    BindShippingAddress();
                    //Auto Select Shipping .... By Bahram
                    selectShippingMethod.AutoSelect();
                 
                }