Question

I have a login.aspx. In which there is a code for redirecting page.

Server.Transfer(string.Format("~/admin/FillUserExtraInfo.aspx?UserName={0}",Server.UrlEncode(loginInitial.UserName)));

It did work, then in FillUserExtraInfo.aspx

protected void Page_Load(object sender, EventArgs e)
    {
        // retrieve the username from the querystring
        userName = this.Request.QueryString["UserName"];
        string mode = UsefulFunctions.GetOperatingMode();
        if (mode == ConfigurationSettingValues.OperatingModes.Backup.ToString())
            FormsAuthentication.RedirectToLoginPage();

However FormsAuthentication.RedirectToLoginPage() doesn’t work. The program keeps executing forward until to the end of Page_Load then goes back to login eventually.

UPDATED: During the period, I found the url bacomes http://localhost:53906/Login.aspx?ReturnUrl=%2fLogin.aspx%3fAction%3dLogout

Finally. but I got an error:

Unable to evaluate expression because the code is optimized or a native frame is on top of the call stack.

My web.config:

<authentication mode="Forms">
        <forms loginUrl="Login.aspx" protection="All" timeout="30" requireSSL="false" slidingExpiration="true" defaultUrl="default.aspx" cookieless="UseDeviceProfile" enableCrossAppRedirects="false"/>
    </authentication>

My questions:

1. Why FormsAuthentication.RedirectToLoginPage() doesn’t work?
2. How to deal with the error I encountered?

Thank you.

Second update: I added Response.End() after FormsAuthentication.RedirectToLoginPage() then it works but the exception is still there.

Answer 1

try using Response.Redirect(“url”, false) rather than Server.Transfer().

Response.Redirect("~/admin/FillUserExtraInfo.aspx?UserName=" + Server.UrlEncode(loginInitial.UserName) + "", false);

reference