how to get the previous to previous page name in asp.net

1.You have to store somewhere URL of page you want to recall, for example using ViewState in Page_Load() method:

if( !IsPostBack ) {
 ViewState["ReferrerUrl"] = Request.UrlReferrer.ToString()
 } 

2.Retrieve url from ViewState:

 string referrerUrl = (string) ViewState["ReferrerUrl"];

3.Get name of page with this url:

System.IO.FileInfo fileInfo = new System.IO.FileInfo(referrerUrl);
string pageName = fileInfo.Name;