NullRefrenceException was unhandled by user code

Question

Code below is placed in page_Load. How I should handle this to bypass UrlReferrer when you enter page directly first time and there is no referrer? What I am missing here?

    if (HttpContext.Current.Request.UrlReferrer.AbsoluteUri != null)
    {
        urlReferer = HttpContext.Current.Request.UrlReferrer.AbsoluteUri.ToString();
    }
    else
    {
        urlReferer = "";
    }

Answer 1

Just check UrlReferrerfor null:

if (HttpContext.Current.Request.UrlReferrer != null 
    && HttpContext.Current.Request.UrlReferrer.AbsoluteUri != null)
{
     urlReferer = HttpContext.Current.Request.UrlReferrer.AbsoluteUri.ToString();
}     
else     
{         
    urlReferer = "";     
}