void LoadPreviousPageReference ()
{
if (_requestValueCollection != null) {
string prevPage = _requestValueCollection [PreviousPageID];
if (prevPage != null) {
IHttpHandler handler;
handler = BuildManager.CreateInstanceFromVirtualPath (prevPage, typeof (IHttpHandler)) as IHttpHandler;
previousPage = (Page) handler;
previousPage.isCrossPagePostBack = true;
Server.Execute (handler, null, true, _context.Request.CurrentExecutionFilePath, null, false, false);
}
}
}