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Editorial Team
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Asked: 2026-06-14T15:13:01+00:00

I have implemented my login page and it works fine, but I cannot read

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I have implemented my login page and it works fine, but I cannot read from the ReturnUrl query string parameter that holds the original requested URL.

For example, when successfully logging in from this page:

http://whatever/Login.aspx?ReturnUrl=%2fAdmin%2fmenu-link.aspx

I get the following:

Context.Request.QueryString["ReturnUrl"] = null 
Context.Request.Params["ReturnUrl"] = null
Context.Request.Url.ToString() = "http://localhost/Login.aspx"
UrlReferrer = "http://localhost/Login.aspx?ReturnUrl=/Admin/menu-link.aspx"

Why does this happen?

Thanks for the answers but I don’t use Session State on this particular website so it is not an option for me. The first time the user is redirected to the login page (after accessing a restricted page), I can correctly see the query string in the page_load, however it gets lost on postback.

Here is my page code, I don’t know why it isn’t persisting:

<body>
    <form id="form1" action="Login.aspx" runat="server" defaultbutton="btnLogin">
    //Bunch of html
    <asp:Button TabIndex="5" CausesValidation="true" runat="server" ID="btnLogin" Text="Log In" onclick="btnLogin_Click" /></div>
    </div>
    </form>
</body>
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1 Answer

  1. Editorial Team

    I am reading it in a button event on the login page. It is on the same
    page I don’t know why this is happening

    Your form is not preserving the querystring when the login button is submitted, as such it appears in the UrlReferrer.

    Save the querystring to a session variable or append the query string to the form action attribute.

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