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I have a piece of code that I've tested for a simple user registration code:

 ReferrerURL = Request.UrlReferrer.AbsoluteUri

This property is set for user when he registers onto the website.

For example if user clicked onto the site via some ad, I'd like to get the origin site from where he came from.

With this piece of code I'm only getting the URL of my own site which looks like:

example.com/Registration

Regardless where the user came from... Is there any other way to fetch that information from where the user originally came (if it is available) - if not then just simply leave this field as null...

[ValidateAntiForgeryToken]
public async Task<ActionResult> DoRegister(UserRegistrationViewModel model)

 var user = new Users()
 
 FirstName = model.FirstName,
 LastName = model.LastName,
 Email = model.Email,
 CountryId = 230,
 Active = false,
 PasswordSalt = salt,
 PasswordHash = PasswordHelper.CreatePasswordHash(model.Password, salt),
 GUID = _guid,
 HasSpecialSubscription = false,
 TotalScans = 0,
 IsFreeTrialExpired = false,
 DateOfRegistration = DateTime.Now,
 ReferrerId = referrerId,
 AffiliatePct = 0.15,
 Cycles = 3,
 ReferrerURL = Request.UrlReferrer.AbsoluteUri
 ;

A referrer is a header sent by browsers when the user navigates to another page, so the target site knows the originating site - if a browser is configured to send it (privacy settings or plugins may strip the header) and if the sites use the same scheme (referrers aren't sent when transferring from http to https or vice versa).

But every click resets the referrer to the current page. So if your users flow like this:

External Site -> Registration Page -> Registration POST Handler

Then in the last one, the referrer will be your registration page, not the external site's address.

So you need to save the referrer in the registration page, and forward it to your POST action. You could do so in a hidden form field, or by storing it in the session, or in a cookie. All approaches have their pros and cons.