One of the way is to use the
HttpWebRequest/Response classes.
String Main_Page_Url = "http://localhost:2450/otherpage.aspx";
HttpWebRequest request = (HttpWebRequest) WebRequest.Create(Main_Page_Url);
HttpWebResponse response = (HttpWebResponse)request.GetResponse();
Then,otherpage.aspx page is called,it's page_load event will be executed.