Custom exception page in Asp.net

Sort by exception handling priority
(0) AddCode
Protected void application_error (Object sender, eventargs E)
{
Context. clearerror ();
Response. Write ("error ");
Response. Redirect ("errorpage.htm ");
}
(1) webform1_error in the background code
Add the exception handling code to the error event of UI. Page in the properties of the aspx page.
Private void webform1_error (Object sender, system. eventargs E)
{
Exception EX = server. getlasterror ();
Session ["error"] = ex. message;
Server. clearerror ();
Response. Redirect ("error. aspx ");
}
(2) Add errorpage to HTML code
Errorpage = "http://www.21cn.com"
(3) add an exception handling page in Web. config
<Customerrors mode = "on" defaultredirect = "error. aspx">
<Error statuscode = "401" Redirect = "error. aspx"/>
<Error statuscode = "404" Redirect = "http://www.sina.com.cn"/>
</Customerrors>
(4) set the exception handling page in IIS