Request.UrlReferrer.ToString() ->System.NullReferenceException: Object reference not set to an instance of an object

Question

When I try Request.UrlReferrer.ToString() this error occures:

System.NullReferenceException: Object reference not set to an instance of an object

Answer 1

You have to check if UrlReferrer is null, as it's not always set (ie, when someone typed the URL directly into the address bar, or clicked on a bookmark)...

(Request.UrlReferrer == null) ? "" : Request.UrlReferrer.ToString()