EasyShop/Account/Login.aspx.cs

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using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;

namespace EasyShop.Account
{
    public partial class Login : Page
    {
        protected void Page_Load(object sender, EventArgs e)
        {
            RegisterHyperLink.NavigateUrl = "Register.aspx";
            OpenAuthLogin.ReturnUrl = Request.QueryString["ReturnUrl"];

            var returnUrl = HttpUtility.UrlEncode(Request.QueryString["ReturnUrl"]);
            if (!String.IsNullOrEmpty(returnUrl))
            {
                RegisterHyperLink.NavigateUrl += "?ReturnUrl=" + returnUrl;
            }
        }
    }
}