Finding previous page Url

Question

i am trying to find the url of previous page.Such as if a user navigates from Page A to Page B using Server.Redirect("B.aspx"), page B can display the url referring to it.

I have tried using

Response.Write(Page.PreviousPage.ToString());

Response.Write(Request.UrlReferrer.ToString());

Response.Write(Context.Request.UrlReferrer.ToString());

Response.Write(Request.ServerVariables["HTTP_REFERER"].ToString);

but all in vain it gives me null exception error

Answer 1

You can save you current page in the Session and then retrieve it from there:

string previousPage = Session["PreviousPage"] as string;
Session["PreviousPage"] = System.IO.Path.GetFileName(System.Web.HttpContext.Current.Request.FilePath);

This way the previousPage string will always contain the previous page's filename, and the Session variable will contain the current page, ready to be used on the next page.

This way you can also detect if the referrer is an outside link because then the previousPage string will be null.