How to check user is coming from specific url

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I am working on some asp.net website with paypal payment gateway. I want when transaction is successfully completed then user will see a success page. But success page is only open when user come from paypal website.

C#

protected void Page_Load(object sender, EventArgs e)
    {
        if (Request.UrlReferrer.OriginalString.Contains("https://www.paypal.com/"))
        {
            if ((Request.QueryString["id"] == null || null == Request.QueryString["id"] || Request.QueryString["id"] == ""))
            {
                Response.Redirect("Default.aspx");
            }
            else
            {
                //code for execution
            }
        }
        else
        {
            Response.Redirect("Default.aspx");
        }
    }

Posted 25-Feb-15 10:12am

Raj Negi

Updated 25-Feb-15 10:13am

v2

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Sergey Alexandrovich Kryukov · Answer 1 · 2015-02-25T10:18:00

Solution 1

This is called "referred", can be sent to you in HTTP request coming from another page. Here is how: https://msdn.microsoft.com/en-us/library/system.web.httprequest.urlreferrer.aspx[^].

—SA

Posted 25-Feb-15 10:18am

Sergey Alexandrovich Kryukov

Comments

Raj Negi 26-Feb-15 2:28am

can you please correct my solution.

Sergey Alexandrovich Kryukov 26-Feb-15 8:47am

Looks fine from the first glance. I don't know the other detail your expect, such as query string parameters. What's the problem? It's easy to debug. Also, I would use not Contains but String.StartsWith. Even better, I would use parsed URI components (authority, host, etc.) to identify PayPal.
—SA