Need to redirect user and need requesting URL

When a user hits a URL from an email, say. If they are not logged in, I need to send them to the login page. Then, after succesful login, I need to navigate them the page they initially requested.

What variable do I look in to get this URL?  Or must I save the URL as a local variable, then use it at the appropriate time?

Thanks,
newbieweb
newbiewebSr. Software EngineerAsked:
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Todd GerbertConnect With a Mentor IT ConsultantCommented:
If you're using the LoginControl on site 1, you can handle it's LoggedIn event.  Check for the presence of ReturnUrl QueryString parameter, and if it starts with "http" then use Response.Redirect() to send the user there.
protected void LoginControl_LoggedIn(object sender, EventArgs e)
{
	string redirectUrl = Request.QueryString["ReturnUrl"];
	if (!String.IsNullOrEmpty(redirectUrl))
	{
		if (redirectUrl.ToLower().StartsWith("http"))
			Response.Redirect(redirectUrl);
	}
}

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Then you can put links in the email along the lines of:
<a href="http://www.site1.com/login.aspx?ReturnUrl=http://www.site2.com/somepage.aspx">click here</a>

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Of course, that ReturnUrl parameter should be UrlEncoded, so it would actually look like:
<a href="http://www.site1.com/login.aspx?http%3A%2F%2Fwww.site2.com%2Fsomepage.aspx">click here</a>

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newbiewebSr. Software EngineerAuthor Commented:
There are two distinct websites of ours. So the link will be to the second site. I need to log the return URL so when the first site gets the request, it will show the log in screen. On successful login I want to read the return URL and render that page.
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newbiewebSr. Software EngineerAuthor Commented:
My code can handle linking from site #2 to site #1, for login. I need to find to what variable I can attach a return URL.
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Todd GerbertConnect With a Mentor IT ConsultantCommented:
Oops, the encoded one is actually:
<a href="http://www.site1.com/login.aspx?ReturnUrl=http%3A%2F%2Fwww.site2.com%2Fsomepage.aspx">click here</a>

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This worked in a simple test for me, but I've only got one site, so I just had it send me to www.google.com.
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Todd GerbertConnect With a Mentor IT ConsultantCommented:
Okay, setup a quick pair of web sites and configured them for cross-app authentication, and using the ReturnUrl QueryString parameter seems to work well.
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newbiewebSr. Software EngineerAuthor Commented:
Thanks!
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