programmatically return user back to current page on login

Question

User1909155429 posted

To open my page users need to login. 
What happens is users click button to open page in the modal dialog. when not logged in the login page appears inside modal window and remains open once user authenticated

and current page shown in new modal window on top of the login window ? 

 I need to either close login page after authentication process or else programmatically redirect user back to current page after login from code:

Using the aforementioned script does not return back to current page.

Protected Sub ButtonPopup_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles ButtonPopup.Click

  If User.Identity.IsAuthenticated = False Then

Response.Redirect("~/Project/Authenticate/Login.aspx")

End If

   Page.ClientScript.RegisterStartupScript(Me.GetType(), "PopUp", "window.showModalDialog('..\Project\Details.aspx', 'test', 'dialogWidth:830px;dialogHeight:800px;resizable:no;scrollbars:no'); ", True)

End Sub

Answer 1

User465171450 posted

You do this by passing a parameter to your login page such as ReturnUrl. That's what the standard membership systems do. That way you can then check to see if there is a querystring variable for ReturnUrl (or whatever you choose) and use that to redirect back. You can try:

Response.Redirect(ResolveUrl("~/Project/Authenticate/Login.aspx") + "?ReturnUrl=" + Server.UrlEncode(Request.Url.AbsolutePath));

and in the login

if(Request.QueryString["ReturnUrl"] != null)
{
   Response.Redirect(Server.UrlDecode(Request.QueryString["ReturnUrl"]));
}
else
{
 // redirect wherever.
}

Answer 2

User1909155429 posted

How may I append the querystring parameter value onto the path ?

e.g

MyProject/ProductDetails.aspx?productid=48

Thanks